S60-RP

Rail with plate

I was thiking RS/2 + plate,

but isn't RR/2 + plate better? (T-branching) for strength & compactness?

Because it can bond bidirectionally with other rails

Only case where RS/2 + plate is better is corner (edge and actual corner)s.

https://gyazo.com/369554305c9a3bd9aa4d2d03441e7a2d

Other candidates

resin foam

chemical wood

rubber