Ah I've still got relative youth (and only a dodgy knee) hahah
Ours can/will likely have some too, but that's a problem for a future time currently. We (the wife) thought up a way to do it so if it comes to it I'll have to manufacture, but I personally love doing stuff like that really.
I can't open Lowes properly from Europe (apparently? Is that new? Or are you just against Eastern Europe). Can you screenshot it? I saw those square bricks with the 4 sides and a raised bed with levels using the wayback machine, but I dunno if it's even the accurate one
I've seen those around I think, but I don't think they're easily available, if that makes sense.
The shop I go to here does cutting to length too, all the wood there by default comes at 2.5m length, which is a great coincidence for this build (and for my car, as it's the max I can fit without hindering myself). They offer to cut it for a pittance so I usually do it there for the basic cuts, and then adjust/finish at home where needed.
4k screenshot so click on if more clarity needed.

). Can you screenshot it? I saw those square bricks with the 4 sides and a raised bed with levels using the wayback machine, but I dunno if it's even the accurate one 
