I guess what I'm still trying to understand is whether the restriction for "no flight over built-up areas" apply to non-factory built RAA aircraft only? i.e. does this apply to 19-xxxx aircraft but not 24-xxxx aircraft. Well specifically if I wanted to purchase a 2nd hand RAA aircraft, but wanted to be able to fly into Class-D airspace/aerodrome without problems can I basically do that with a 24-xxxx registed, but not a 19-xxxx registered? (still haven't been specifically able to see this distinction in the regs...)