Best tool to rejoin imported DXF shapes?

When I import rectangles to SU from Vcarve, they revert to individual lines…

What’s the best tool/method for quickly turning these back into rectangles?


See this SU file for ideas.

Filling rectangles.skp (215.9 KB)

You can use the welding tool but if you extrude them the edges will be smoothed. Why do you need them to be welded by the way?

Would like to be able to Dimension them and possibly extrude them, which is much harder to do in Vcarve…