BBox a curve along parent curves' division points?

Hey guys, 

Brand new to grasshopper... only been a few weeks but I've gone through a ton of useful information here.. thanks!

So, at every 3m of my buildings' section curves, I need to repeat a 4x8 rectangle. My building curves are curved, so if possible, those rectangles need be perpendicular to the curve somehow at those division points.

All this is so that I may make a model of the building, using those rectangles as cut-out placeholders to insert a diagrid.

Many thanks!