I don't know where you are located, but they have a t-bucket round up here in town ever year. (Mountain Home, AR July 16-21 2007). I intend to annoy them by driving my 56 ford truck around the areas where they will be crusing too.
You might want to attend a show (not necessarily this one) and talk to a lot of owners and sit in theirs to get ideas of what fits you as an individual.
There is a place here in town called spirit industries that builds T-buckets. They sell parts and pieces too and "kits". The site is good reading even if you don't get anything from them.
They have a tech forum, but I have not visited it.
They have a PDF assembly manual that might be useful on their site.
They used to have a video of an assembly (watch on your computer), but I don't know if it is stil on their site.