Due to my knee replacement and being older in general, I find it very difficult to work under anything including a car. I can lower myself down on the normal creeper. I have a model railroad and need to get under it for maintenance, repairs, and building new features. Below are two examples of the kind of thing I need and want to build. I would hope maybe someone on here has done this or has some ideas.
The first one is the best example of a creeper that would help my situation. I do have metal and wood working skills and tools.
Any ideas would be appreciated.