well, the thing here is how far down the rabbit hole do you want to go?
i started with a box stock kit, few bolt on mods like wheels, tires, motor, esc, bec (you'll need it, gets the servo the power it needs to operate properly, castle creations makes a solid one), and steering servo.
then stuff got weird. stuff like the fmj and bearing mods, bearing lists (i have a thing about bearings) and the purpose built parts started happening.
did a full custom chassis design for myself, few iterations, it ended up with overkill. then the front axle plate, then it started to spiral downhill. working with a friend, did the tag wide axle kit, then got into composite wheels, and finally full circle with a new chassis that tgreer and pajey are testing for me in different forms.
point is that you can really do anything with these rigs. you can stay with a more traditional mostly stock parts layout, or you can head off the deep end on it. a lot of the parts i make are meant as comp performance upgrades, so the compers have more options. with 4 wheel steer, your rig is more of what we would call a bash setup, and for that, the stock chassis is great if you can make it work.
there is also the small segment of the losi community that does scale work like GiJoe (scale losi's yoda) and your rig would be a good start for that segment, but will take work to fit scale rules.
if you can dream it up, you can make it. just a matter of time and resources to do it.