You can use what basically looks like contact paper (i.e. the stuff used to cover books in primary school) to make clear glass windows look frosted. Something like this from Bunnings: http://www.bunnings.com.au/handi-home-900mm-2m-plain-frosted-decorative-window-film_p3960052 However, you may want to talk to your builder first as they may be able to replace the glass in the front door for a decent price.

Most door companies stock what you are looking for.

Just a few thoughts. I like the overall concept of the kitchen but it is rather disjointed. I agree with clearing everything off the surfaces and trying to keep them free miss a feature bowl for the island. You could add an eating area as this would make it more purposeful but I would not do it if it compromised the size and functionality of your living area. The piece of timber joining the two walls at the entrance seems superfluous and I if was removed it would instantly look more contemporary. You could extend those walls up to the height of the cabinets and repaint in a lighter colour. This could reduce your light but this can be dealt with in other ways. I love wood cabinets but the top ones up look heavy- perhaps they could be painted a light colour to reflect the light coming in from the entrance but I would revisit your lighting in general. There is a lot of timber with the floor, cabinets and ceiling and this makes the space quite dark? if you did extend your walls you might find the kitchen darker so paint cabinets. I like the idea of wallpaper but only if you have an even shaped wall and if the pattern works with your living scheme. Whatever you do with your walls will need to correspond with the adjacent entrance walls. You didn't mention your budget but I would start at the simple end and if it doesn't give you the result you want move to the more complex solutions. All the best

if the door is solid wood (you can usually tell because it will be very heavy) and the putty and or timber mouldings supporting the glass is carefully repaired and the hinges and door handles are replaces and sealed all around and the door is painted on all SIX sides with a good quality paint/varnish it should be OK but no door will withstand the full blast of hot sun and rain so hope there is a porch or wide eaves for protection...a light weight hollow door will probably only last long enough to save up for a new door, so hope the retro door works for you...btw make sure the door is resized and installed to suit all the extra coats of paint and have the security door made last as old style door thicknesses can affect the installation requirements and costs of the security door