Baccus and Irregular do buildings for the period too. Quality seems to be much as you’d expect from both manufacturers.
If I were looking to build a whole battlefield with lots of buildings I’d probably go for the Total Battle ones, thanks to the proportions, quality and extent of the range. However, thanks to the proportions they might not play well with those of other manufacturers, so you might find yourself committed to them.
Unless you’re planning on doing a siege, though, the number of buildings you need on any battle will probably be pretty minimal.