Can you make them into a "scale" crawler? Not true scale, no. You can put a scale looking body on them and some other bits, but if you're looking for a scaler, I would look elsewhere. For crawling they're fairly decent with some mods, but out of the box I wouldn't expect perfection. For "mudding" I would suggest a different rig, but if you wanna take the RS10 in mud, you can...you just need to waterproof the electronics. The servos, much like in any RTR rig, suck...they should be replaced ASAP. The other electronics are fairly decent and seem to hold up fine. My suggestion is to do lots of reading and research before you buy a rig.