Can't find postings on the Pug now, but looked at those brochures listed and think that was one neat little rig! Had Tec engine, worst part, heh! Not sure how engine connectted to the drive, but rest is jeep like axles. Would be neat to see the parts blow-ups for one. There's that 4x4 system that some guys here are talking about! Maybe one could copy or close if had drawings?
In the brochure shows attachments. There is an Earthcavator that has the whole box turn and the Scarifiers are solid on the back side. You turn 90* to rear and they face down and dig in. Now that's a neat idea! A guy could make his homemade one do that I think.