Not to sound like a smart a@%, but, You need to go and find sites about building or I have even seen some books about this.
I too plan on building my own tank one day. I am still looking for a good book to buy. The problem is There are so many details involved in building someone would have to write for days on this topic.
I saw a book on E-Bay one time. Might be worth checking out.
Good Luck and let me know what you figure out on the book.