re: the roof raise, the way 90% of them are done on skoolies is to weld jacks to each corner, remove windows, make cuts on all the "hat channel" frame members that run beside the windows, then jack it up to desired height, level, and weld new iron in the gaps. The bus windows generally are leaky noisey things so most attach sheet metal over the gap then install a few RV style windows.
Bucket lift, LOL, sounds pricey on it's own, how would I mount it to the bus so it didnt severely disturb the aero? :P
Aluminum reflectors for solar: While that would technically work and be cheaper, the higher operating temperatures that would result in the panels would both reduce their efficiency and their calendar lifespan. Would need liquid cooled panels
Something else that bears mentioning aero-wise: I'll likely be towing a little Honda Insight behind the bus as our run-about vehicle.