Ah! Ok, was a stupid question. Apparently I am still dependent on the way 2D programs work usually (select is moving, too). I'll look into how to change the move icon to an arrow, then Thanks for the heads-up!

@ben ritter said: plwyood/mdf has warped yet MDF is very good at NON-warping. But I would not make these elements from MDF, mainly because of its weight, and structural/security concerns. The plywood is also good at not warping, because the layers (the more the better) are fiber-crossed. I mean, for the sizes in the photo, I will use a thick plywood, which in turn may have say 7 or more layers. Otherwise, these architectural elements can be made from lighter materials (i.e. hard-PVC, or even drywall).

Thanks TT! Will look into the resources, and bother you with some more questions, I am sure

Hi, Really interesting, thanks a lot for this (old) thread That's a part of the solution for my (old) problem https://sketchucation.com/forums/viewtopic.php?f=80&t=71894 now, i know how to write with Ruby X*Y on my unique component. Ideally, i would like to do something like that https://sketchucation.com/forums/download/file.php?id=158092&t=1 But as i don't know Ruby ... and i'm absolutely not a developper I think i can do a small modification of this to do just this but i don't know where to begin, to do this, i would like to select my components, so that the extension count the number of instance so that it write number * Length (X for horizontal or Z for vertical ... or Y following component axis for inclined plane for example) i think i can find information to draw a line adapted to the bounding box ... (in "Automatic Sketchup" by Matthew Scarpino) ... how to position the leader and the text (in the same book) ... maybe how to draw the rectangle around the bounding box while creating another layer ... ("Automatic Sketchup" by Matthew Scarpino too ?) but i don't now where to find how to write Number * Length with text i found something about it here https://ruby.sketchup.com/Sketchup/Selection.html#count-instance_method it's the beginning, the solution is near ? Can you help me please ? Thanks Best regards