Just came across your thread,
the thunder tiger pro 70 and hot bodies .46 are turds,
ran both, pro 70 in my mgt and 46 in a truckzilla
a decent 28 engine would out accelerate and get them on top end,
ive bought brand new old stock parts for a savage twin,
my fueltank came from France
https://www.efm-modelisme.fr/article/265250
fuel tank came with 2 original twinzilla air filters and all fixings and fuel lines,
and the chassis plates and motor plate parts came from Ryper hobbies in Australia,
also ordered the rear shaft and linkages from them,
just received the new screw set today from a dude in France,
have 2 New Go28 engine, rebranded as trackstar 28 engines that arrived today,
the only parts I need now are both sets of motor mounts,
And the chassis stiffener, but this part looks easy made from a piece of 4mm alloy plate,
it just a brace really that holds the throttle linkage arm,
have you been successful in finding any, twinzilla parts?
il post pics of mine if you like?