I've considered building out of solid phenolic panels before. Something like Wilsonart SPC. They are solid phenolic with almost any plastic laminate decorated sheet fused to the surface. The 1/2" thick stuff is what I've seen cabinets and lockers built out of. Only trouble with the stuff is it is not cheap, it is heavy, and you need carbide tools to fabricate it with. But it is practically bulletproof and can be very good looking. Formica has a similar product and so does Trespa.
Wilsonart's website says:
Wilsonart SPC is a HPL compact board with high impact strength, particularly high
resistance against water, steam, and moisture; therefore, it is suitable for both interior and
exterior works (exterior grade). All the variety of designs can be chosen to make one-sided or two-sided SPC. The designs are varied from solid colors, woodgrain, stone and graphic designs. Due to the excellent
material characteristics described above, Wilsonart SPC can be used almost without restrictions
for various applications such as interior wall feature, exterior wall, claddings, bathroom furniture,
shower room partitions, toilet cubicle, elevator walls, escalator claddings, balcony cladding,
partitions, kitchen countertops, shelves, doors and direction signage.