Everything is cool and all, but the British Forces have no form of stock indirect fire. Churchill being defense and Firefly being offense makes more sense, and offense has very inadequate AT firepower (i surely wouldnt trust an m10) making defense the choice every game. Well, i say "inadequate" but defense looks like a no brainer atm...
Pioneer 3 mp40's would have to be good in order to be worth the upgrade.
If you wanted to make a authentic and cool North Africa faction you HAVE to give it lots and lots of non-doctrine artillery. The massive artillery duels are one of the coolest things about the North African front.