Scrapiron Scher posted:Kwisor . . . . . Be sure that the framework is strong enough to support you if the access hatch is not close to the inevitable derailment. I spent four months in physical therapy after falling through benchwork on a layout.
I cringe when I read that guys/gals are using 1/2" ply or foam for their layouts. I suppose it's great if the layouts are NEVER to be climbed on...but I always do some leaning (maybe a little crawling/maybe a little standing 
) on my layouts, so I play it safe (very safe & and no question overkill): 3/4" ply with substantial vertical posts. There is a difference in cost - though not much - and an ounce of prevention prevents four months of PT.
Just my preference. 
