Your list looks good considering your local laws. (Personally I'd move!)

If you're going with a midlength, I'd go with the 12" LaRue and cover the gas block. Just my opinion.

Are you doing the build yourself? Fairly easy and straightforward as long as you have the (correct) tools and know how. Tools like the barrel wrench, and front take down pin install/removal tool, and know how like using the correct spring behind the plunger for your bolt release. Use the wrong one and you'll have to drill the plunger out. Leave the spring out from underneath the disconnector and you'll have an inadvertent/intermittent (unreliable) auto.

Without a doubt it's fun, easy, and you can say you built that rifle. Whatever you can't do, hopefully your local gunsmith can. Remember some parts will be under spring tension and having extra springs, plungers, pins are always a good thing.

Have fun, don't put an eye out, and don't forget to post pics.

If you have any problems, PM me. I am on the other side of the world, (Afghanistan) so it may be a few hours before I can respond.