I don't know about the bulkheads I think a strong bulkhead brace would do just fine. As for the diff cases if you have a stiff bulkhead why bother? I find the stock setup to be quite strong and if I break a part I'll RPM it! I wonder what people do to their trucks if they say the emaxx is not very durable. I've jumped mine 25' off a bike ramp (actually measured and caught on tape) and once I doubled up some bike ramps and got 7-8 feet of air (on tape) and driven it down stairs smashed into trees, jumped it once and it ripped off the wheelie bar but nothing broken in my entire 3/4 ownership