Hello 61karwin, I do not have a range hood just an exhaust fan. I do not do much in the way of frying, I am however rather good at 'carbon' but find with a good breeze thru from open windows that it is no problem. The fan does need cleaning every now and then but I get a tall person to assist: a young one who is happy to get onto the bench! I do not see a problem unless your home is not well vented and you like cooking hot chips! Cheers Margot

Some will specify distance and angles permitted. Check installation guides out

I am thinking of not walk in wardrobes but high quality wardrobes with various fixtures inside.

Builders markups on upgrades can be large. Unfortunately it doesn’t matter a lot what we tell you if you’re locked into a building contract with your builder. You can’t get alternative quotes and you can’t supply your own. So it’s difficult. But for your own sanity check have a look at the benchtop pricing on diyaustralia.com. They have pricing for the different ranges of major benchtop suppliers on their site.