You should be able to do three panels in those windows up into that arch with horizontal louvers and fully functional. Your shutter maker just needs to line vertical posts up where you have vertical mullions! giving that center shutter something to hinge to. Here are a couple of similar windows I have done. It's a partial arch but it's the same concept with yours

It's really hard to provide advice without getting a feel for your decor . Plantation shutters can look great, are not a total block-out solution but can be close and sufficient for most people to be able to sleep with. A lot will depend on the quality of the shutters and how well they are fitted. I think the post bigreader was referring to can be found [here[(https://www.houzz.com/discussions/block-out-blind-behind-shutters-dsvw-vd~4314237). Here you'll find a good example of what can go wrong if you don't choose both your shutters and fitter carefully. You will get a variety of prices and there is a difference from brand to brand, and the materials they are available in. Take some rough measurements of your windows and call around to get some indicative prices which you should be able to get on the phone without committing to a check-measure or any other commitment given to the potential supplier. Do your homework and don't automatically default to the cheapest price. I have to agree with Kerri Graafmans in that Venetians are difficult to clean and I just don't think they will work well if you are working towards a beach feel for your windows. Depending on where you are located, thermal rollers will be a must with just about any window treatment with the exception of Plantation Shutters. The thermal rollers will give you added light control when used in combination with solid drapery. They will also provide worthwhile insulation which, in combination with drapery or a Roman blind, will make a noticeable impact on your cooling and heating bills. Alternatively, Sheer Curtains and Solid Drapes can be made in a large variety of heading styles. Traditional Soft Romans might work well depending on how your rooms start to take shape. Think carefully about your budget and if possible give the consultants and idea of what you are prepared to spend, - Even if it is only a rough idea. Reputable companies will not intentionally pad-out quotes to meet your budget. But they will work with you to ensure you get the best value for your declared budget without sacrificing quality or taking shortcuts just to seal the deal. Always get an itemised quote so you can see what you will be paying for. Fabric, in many cases, will be the biggest ticket item on your quote. If comparing quotes ensure you are comparing apples for apples. Especially for drapery, both in terms of fabric brand and price as well as the quoted 'fullness' of the curtains / drapes you will be purchasing. If you find you just don't have the budget for your ideal window solutions then my best advice is to either wait until you do or think about a phased approach to dressing your windows (say a window or a room at a time). Far better to pay for a quality product that will last for years than to go for something that does not meet your expectations, but which you will be forced to live with, and be reminded of, every time you enter a room in which the treatments were fitted. Above all, get an idea of what you are likely to need to budget for to get the solution you want early. Too many of those that undertake renovations leave pricing the window treatments to last and have not made a sufficient funding allocation to do the job properly. I may be biased, but I truly do believe that good window treatments can really add 'wow' to both a window and a space, - Yet it's often the one item that suffers the most when reno' budgets start to run dry. Hope this helps ;)

Judging by the breeze blocks, the style of the windows and the cypress pine floor it looks like you have a mid-century or post-war home. Internal plantation shutters, while practical for privacy and control of light aren't of the period and don't do much for the control of heat loss or heat gain as they are so many gaps. The most traditional answer would be a combination of sheer curtains and lined curtains with pelmets to give you good control of light, privacy and heat loss and gain. The other style that works well with mid-century homes is honeycomb blinds, such as Luxaflex duettes. They act like a blanket to your window when closed and as they can open from top and bottom it means you have great control of light and privacy, so are more versatile than internal plantation shutters. While they are a contemporary product, they have clean simple lines, so look less visually busy than plantation shutters. https://www.luxaflex.com.au/products/blinds/duette-shades/ Best of luck with your mid-century/post-war home, Dr Retro of Dr Retro House Calls and Dr Retro Virtual Visits

I'm a big fan of plantation shutter. They look beautiful and are pretty simple to clean. The only thing to be aware of is if you have internal fly screens fitted and then have plantation shutter fitted, you may not be able to remove the fly screen from the window because of the plantation frame. This means the inside of that window can no longer be properly cleaned. Please bear this in mind. Stay Clear Window Cleaning