I broke down and bought the Revell 1/100 AT-ACT. I wasn't sure what I wanted to do with it, then it hit me. Build a Star Wars WW2 mashup. I figure a Deutsche Afrika Korps AT-ACT would be awesome. I have a fascination with the North African campaign, and Ive been wanting to build a DAK mashup. Scarif and certain parts of north africa have a similar terrain, and the DAK symbol is a palm tree, so it'll work great. Also the north african campaign was fought more in the supply lines than on the front lines, with sabotage and air raids, so either side could have benefited from a cargo walker.
Since the AT-ACT is 1/100, Ill use the Zvezda 1/100 panzer iv turret to replace the ones in the kit. But I need to heavily modify the head for it to all work and look right. Grind and replace all the armor plating on the sides. Then move the turrets back a centimeter, or so. Outside of that, it's just a matter of adding tank parts, paint and decals. I also have in the works a Scarif/DAK trooper.
Also I noticed you can kitbash the Revell AT-ACT with the MPC AT-AT, with a little cutting. If you swap the underbelly and drive system, but keep the legs, you get more accuracy and articulation. I won't do that with this, but a future project.