Regarding Q4, I think it's worth taking a look at the MGL product. Certainly significantly cheaper and more options to configure and change things to your design. It's not necessarily easy as the manual is not well written but, thanks to some great videos and information from a very helpful chap on the MGL Forum, it is suddenly making a lot more sense and give you a chance to do things that you cannot with Garmin, Dynon etc. I think the likes of these companies have a more polished result in their displays but you pay for it and then continue paying with all the updates etc, whereas with MGL you can do a lot of it yourself.