Quick update:
Really just a better pic of still wip Scavenger. Coming along nicely but this weekend I have to redo Buster Prime and ROTF Prime into G1 inspired so Scavenger will have to go on the backburner for a bit.
As you can see in the pics, I drilled holes in the shovels (meassure distance is important for them to connect in vehicle mode)
Cut out one of soundwaves toys from each foot and peg the whole system to each claw. Make sure to NOT go over the size of the hole if anything so be carefull. The rotate inside and I mean from the peg not the articulated feet points.
Pretty easy to do in general imo. That's all there is to it. Not sure if the other guy I was inspired by did it the same, but this worked for me.
Now, pics of Scavenger and Long Haul (mixmaster was absent)