Hi, I have a himoto Torpeda, from what I can remeber they are 98% upgradable with the Kyosho parts with the exception of the front arms.

Take a look at a pic of the Mp7.5 and the Bazooka/Himoto/redcat and you will see the difference.

There are front aluminium arms available. I think Redcat have some now, but you can find them on eBay.