Yepp, full scale worked here, too. The separate trick that somebody showed me in another thread worked (just wasn't aware that it was indeed a similar situation). Manually replacing the faces with the big construction planes with faces with normal ones (that are as big as the plane itself) and then rejoining the solid is a good workaround.

I imagine these big construction planes are needed for more complicated lofts? Could these big construction planes perhaps be ommitted in cases where they are not technically needed? (Like in my case where simple faces would probably be sufficient?)