Absolutely 100% NOT legal under the current rules, no way known. Because the rules specifically state -

"Tamiya M01/2 or M03 series "Front Wheel Drive" chassis only"

So that answers that one Marty.

It's important that there is stability in the rules, so like everything else, the M05 (like the Switch) will be considered for next years rules.

But I don't think you need worry about it being 'a lot better'......