That parade footage is really sweet. And I just have to say, with all sincerity, your guys' ectomobile is probably the coolest non-'59 caddy ecto there is. That model is just gorgeous, and totally captures the original spirit IMO. I could easily imagine that version being in the films, or being a replacement in a sequel or something if the caddy got destroyed. I just love the boxy retro look.
Also, it looks like you're mostly going for a GB1 look, but have you ever considered adding some of those LED “for hire” signs, ala GB2, to the sides? The reason I ask is ‘cause it looks like the body’s roof is perfectly shaped for it - you've got that narrow band of negative space (save for the sidelights) on each side. Then again maybe negative space is good, but you definitely do have some empty space there, especially at the reer, to add some extra flourishes. Maybe a “call 555-____” decal or somethin'.
But yeah, that baby is hardcore eye candy.