Interesting Remus...I'm not quite sure what Purplotion tubes are! are they like Twai'lek sunscreen dispensers? (I get your meaning I'm just messing with ya!!!)
For the body of the craft try using a storage box, usually avalailable from mose office supply retailers. Then just find a ship front you are keen on and stick it on the front. Cut out a door to the rear and bolt on engines that take your fancy. I've just found pod racer engines are great for that kind of thing, they make great Purplotion units!!!
