I haven't built anything from the modular systems yet, but I have been pondering it. After adding up the price of the individual wall sections, in the end I think that it is about the same price as an actual kit. An advantage with the kit is that you can get some great details to go with it, but an advantage with the modular system is that you can have virtually any type of structure you want. Or maybe you could get a Gold kit and add onto it with the modular system.
Have you checked out DPM's web site? They have some pictures of different structures built with their modular system. There are some very impressive pictures. Let us know what you decide on doing, I would sure like to see what you come up with.
Freelancer