Welcome Todd!.. It's nice to see another Classic 911 owner!
Re a couple of your queries...
Opinion only; I personally would suggest that you go with the electric windows... As in any car, we have come a long ways since manual windows... With 'sports seats,' with your seat belt on,
you'll find it near impossible to reach across to the passengers side to manually roll the window up or down... Same goes for electric heated mirrors...In any heavy traffic, such as you can experience from Kelowna to West Kelowna, or any heavy multilane hwys, electric mirrors often come in very handy.
Being that your not going the 'all stock route,' are you aware that there are many 911's with a small block Chevy's in them?...They are lighter than a stock 3.0 and 3.2, they are relativley easy to install, they cost about half the price of a used 3.2,
extremely inexpensive to maintain, there are bell housing kits, including all other necessary 'bits and pieces' that are readily available, and most important...
they go like stink!!
The fellow who owns the 930 in the video used to be a street rodder... I've personally spoke to him about his installs... 'Larry' is from North Carolina, and his 930 has a small block LS7 (427 cid-505 hp) Chevy in it, and his other 911 (narrow body) has a small block LS6 Chevy (346 cid-385 hp.) in it...Due to the engine work that he had done on the LS7, it puts out 705 dyno'd hp!!...He did everything himself; there is also a Pelican thread that he posted some years ago now, of the install, including showing his step by step procedures -
It's very interesting!..
Maybe a BiG cam rumble in the Valley ay!
Food for though eh! 
https://youtu.be/NBF5HcXsiI4
LS3 Crate Engine - Race Engine | Chevrolet Performance
*Note: 'Larry' has reversed his intake to the rear firewall... You can see the air intakes for it on his R side windows...He has also mounted the ignition coils on the sides of the valve covers... The Rad is mounted on an angle in the 'frunk'...It's not the exhaust 'tone' that he would prefer, but even with the super set of custom built headers, they basically run straight into the muffler and then out, hense the 'tone'
BTW, the price noted in the link, as you know, is for a brand new LS3 crate motor... You can pickup a low milage used one
for at least half the price of a new one...He runs the stock 4 speed 930 Turbo transmission, including the stock diff... The whole set up, as previously mentioned, is far less expensive than a used 3.2 in good condition.
Check these guys out...
http://www.renegadehybrids.com/