Making your own tank is the ultimate in perfection...but it is really, really expensive...from your other posts, I gather you are on a bit of a budget, and going from scratch is going to be super expensive...a great learning experience, and I certainly think it is a good idea..but be ready with the cash !!
There are some good books out there on building tanks, and several of the posters here build their own tanks...including my humble (yeah right) self...
If you decide you want to sink some money into the project, let us know...always willing to try to help out an enthusiast!!
greg