The Chamonix construction is varnished hardwood (cherry or teak), anodized aluminum, and a carbon-fiber composite material that seems exceptionally rigid, with the occasional bit of stainless.
I wouldn't leave it outside in the sun / rain, but I'd be very surprised to encounter any warping under normal use.
As for precision, they're not geared, so it's a question of how delicate your touch is. The N/F series, the front standard bolts into the focusing rail, and it has a textured based that grips the rail reasonably well, but a good thwack can shift it's position. So don't do that.
Chamonix claims a minimum bellows draw of 45mm (!!!) on the 45N1 (most of the other 4x5's are in the 50-52mm range), but I don't think the stock bellows would work well. Fortunately, they offer a bag bellows, and they're trivial to swap out (2 minutes or less, no tools). They also offer a "universal" bellows which has a bag-ish section at the front to allow for more movements with wide angle.
The H series is a bit more "traditional" design with focus knobs on both standards, and can be stored with a lens in position. The front standard looks slightly more rugged with a lever lock. Bellows draw is listed at 60mm.