Hiya mate, just a few suggestions !
As it is a freestyle build I wouldn't go putting CW pro bars on the bike....they are too high and will look wrong imo. I would put on something with a lower crossbar and more freestyle orientated, some Skyway EZ II or maybe some fake Haro bars or even CW freestyle copies with the twin crossbar. I would keep with a chrome post and bars if the frame is chrome.
Spoked wheels or tuff mag wheels....the choice is yours, Personally I feel a freestyler should have mags and being as yours is an Aero some Aero Zytecs would be perfect, not too expensive and some say as good as skyways. The Kenda K55 tyres Dan suggested above are also perfect for the bike...easily available on ebay...you may have to order from states.
If you have a fetish for blue anno'd parts then go ahead but personally I feel are a bit dated for the frame as all the wild pink, green , white, and lavender parts were available by 1985 and most freestylers used them.
Brakes......firstly I would build it with a hollow stem bolt for the front brake cable (potts mod)so make sure you get a stem with one! and depends on your budget but old MX1000's very pricey especially if nos and the rpro ones are nasty, and again a little dated for the bike although era correct. I would be more inclined to go with FS880 front caliper as its designed for potts mod straight out the box and either a rear 880 or MX901 (both come in blue anno too!)
best thing to do is look at the museum at reflex builds and decide what you like and don't like and choose parts accordingly...doesn't have to cost a fortune to have a classy looking bike instead of ending up with something that looks as if it has been finished with parts left over on ebay!
Sizes
seatpost 22.2 although that frame needs a shim which you have hopefully got with the frame?
one piece crank....sugino or takagi 175mm arms
bottom bracket 24tpi usually
tires 20 x 1.75
hope this has been a little help!
Damo