[GZG] 25mm SG PAs as 15mm Combat Walkers?

Has anybody tried using 25mm SG Pas as 15mm Combat Walkers. They look like
they'd be on the smallish end of Class 1. The ESU and NSL ones look to be the
best for this (less anthro) than the NAC or FSE. The UO ones might work too.
If you were going for the heavy duty anime look, the Japanese ones might work
well.

Eli