Beams (and masts, flagpoles, ballista arrows, ..) will necessitate reorganizing the woodworking options, starting with multiple-tile trees, and then everything further down the chain.
I think there's room/need for:
- beams: longer than 1 sq. Can be processed into logs
- logs: cut beams, fit in one square. Presumably the yield from 1 tree should be enough to build a log wall (=palissade) in one square.
- (Planks: for furniture and architecture if construction is refined, and stone slabs exists as equivalent. Otherwise, include functions in blocks. Could be engraved, painted, etc.)
- blocks: useful for whatever blocks are used, and as a base for wood crafts.
- wicker: among other plants, tree branches can supply it.
- sawdust: will be handy in stables, as emergency meal, base for paper pulp,...
- Anything wooden should be able to be marked for recycling, much like metal. The larger pieces will be cut up into smaller pieces. Possible uses: charcoal, firewood, turn to sawdust, ...
'Beams' become 'logs' become 'blocks OR planks' become 'sawdust'. Wicker is directly harvested and used, or marked for recycling.
With flexible workshops (flexible in area and tasks) everyone will be able to put the tasks where he likes, but standard I would expect to find the tasks of cutting/sawing logs in a woodworker's workshop (with all the other ones, woodcrafters, carpenter, coopers, etc.: they need the same chisels, saws and stuff). Woodcutters can store their axes and saws there too, if they're not using them: cutting/sawing up trunks into logs would be done by woodcutters, wherever the trunk happens to be.
Cultivating and harvesting cork oak bark would be great too, for bottled wine and floating stuff.
Cutting down a tree should also yield plant material that isn't fit for anything but compost or animal feed. In the most cases that could be ignored, though on some maps you might want to collect that resource. Should be an option in the menu: process tree side products? yes/no. If turned off, cutting trees doesn't generate plant material or fades very quickly outside. Otherwise, it lies on the ground for someone to collect it where the trunk is cleaned.