Here's Pearson's CAS-1-Mod-3EV ride, almost finished, but not quite done. It took quite a lot of fettling and filing to make the crane swing arm, which still needs a bit more work as I have to fabricate a claw.
Once that's done, then I have to figure out how I want to attach the parts for a mortar to this mech. Not sure whether to have the mortar permanently mounted to the back, or have it as a replacement for the crane arm?
Let me know if you have any other ideas in the comments.
Stay safe, have fun.