Kris, didn't build a jig but instead built many of the same size individual frames and then connected them all together. Once they are all connected the layout is very strong and doesn't have any give or rocking to it. Wife actually joked if there is ever a tornado the safest place will be under the layout.
Mark, I belong to a few groups and we do have open houses all the time. (not to the extent that Alex is having) and I already signed up to host one in August for my Friday night guys. I kind of strive on deadlines if not I would probably be sitting around all summer watching old reruns of 80's tv shows.
Paul, thanks for the compliment and I am trying to get enough done that I can have the Tuesday night crew over in the fall.