Perhaps Masonry should be separate from the Stoneworking?
Or (as I postulated[*0*], as an afterthought, but taking up far more text than I originally meant to) make skill-trees. And/or cross-disciplinary requirements for some tasks.
As fo getting skill puttting up a wall and taking them down (noting that you can, apparently, get architectural skills for
preparing some constructions, regardless of whether they get built), surely the balance here is time? If you get 30 units of skill for (irreversibly) making a stone chair, then maybe you only 2-5 units of skill for a wall, depending on how you want to balance it (or c.f. rough walls with finely made walls with the best stone blocks[1]).
It might be about a week of game-time to make the chair, and a few hours to build a wall (half an hour to dissassemble it, probably to no additional skill[2]). The balance between the two is time.
[*0*] Inserted Addendum: Managed to forgot to put "in another thread just now" at that point within that convuluted sentence. (The following feetnetes are original, this one has been edited in after posting.)
[1] Setting aside the issue of walls constructed of standard stone blocks is probably easier for any old schmo than it is for the artisan to put together an equivalent structure out of irregular mini-boulders. Maybe time taken and ultimate quality are dealt with differently, though.
[2] Though I'd like the idea of child disassembling structures[3] and earning a piddling but cumulative amount of experience, a bit like they already do with impromutu (non-"Only Farmers Harvest") reaping of the fields, meaning that some of my 2nd-generation kids have been known to be Adept Growers or better when attaining adulthood. (At least they have when I overdo the various plantations, rather than underdoing them!)
[3] Health And Safety aside.