Lightweight wooden field camera here. I really would never even consider a 210mm f/5.6 Plasmat for carrying in the field; too heavy and bulky, My preference are for lighter designs, albeit at the expense of maximum aperture. A few of these are the Nikkor M 200mm, the Schneider G-Claron 210mm, the Fujinon A 180mm, and one of my personal favorites, the Ektar f/7.7 203mm. I'm sure there are others. Even the Fujinon L 210mm Tessar is smaller than the f/5.6 Plasmats. Coverage on 4x5 is no problem with any of these lenses; they all cover 5x7.
If you're interested in building a lightweight kit, consider one of these.
Best,
Doremus