Most if these systems looks similar to meccano, so anyone w/ access to a drill and measure could actually make stronger parts. And the strength concern is all

Most if these systems looks similar to meccano, so anyone w/ access to a drill and measure could actually make stronger parts. And the strength concern is all the holes weakening the very spindly looking frames. I'm not bored enough to do the stress calcs, but it doesn't look sturdy enough that I'd trust a kid on that bed.