Well, the thought about being removable and light-weight is that you can take the supported contours to a work table for the build and finishing. I know that you have a system that works for you. I found it handy to be able to work on the landform off of the train table.
I suppose that you can still do that using your method. Just add supports to the contours where they are and then lift them off.
Thanks for detailing the benefits of L-Girder and your methods. It should be helpful to many. Add some tags to this thread so others searching will find it.
Here's a photo during the disassembly of my test layout. The hump mountain (spackle on screen) covered the front of the cast radiator, the biggie hides the electric panel and the failed portable spiral module. Mountain is good - I used 1/8" board for spiral and it wasn't strong enough. The two pieces are meant to be transported and placed onto LCCA small corner modules.
Oh, the grandkids table photo, just because. Cranky still complains...
