In terms of making some sapper props more viable:
Small cheveux are great now: reducing their cost to 2 BP, and maintaining 4 hits to build means they're very effective in very limited situations (doorways, etc). Two thumbs up from me.
Gabions I would like to see also become more competitive. They're somewhat useful around cannons, but I find (sandbags, small chev, etc) more useful. The current cost of 3 BP is good, it should be more expensive than small chev since it also has bullet protection. Could the hits to build be lowered from 8 -> 4-5? It would be more consistent (small props are cheaper, faster, but smaller surface area).
Before, there were almost always something else more cost-effective to build than ^. Making them more competitive gives us more viable options.
The planks I think have suffered a bit too much. If there's something close to a plank that I want to fix/destroy, I usually end up breaking the plank.
I know there's the everpresent problem of spamming/trolling, but on the other end, there's also griefers (albeit a much smaller problem). Planks have always been finicky to place and they have a mind of their own. They're fixed now so they can't be glitched.
Seeing them as weak as a window, and getting shredded at the slightest touch is incredibly frustrating. Planks were very useful covering up mistakes, linking fence segments. I would like their strength increased to around 1-1/2 full sapper axe hits.