Welcome to the forum. Have a good look around, explore this forum and the archived-forum. There have been many concepts that did not make it into the contests.
Please be aware that there are certain people that will, if given the chance, attempt to make personal financial gain off interested people that appear to have resources available. The vast majority of us do not have the means to build these concepts, or actively participate in the TSI project.
Some of us have gone to great lengths to document the feasibility of our proposals, from construction methods, on through various operational aspects.
Once again, welcome.