Yes I see that. I bet the location of the external speakers, present the sound well. I was just thinking how cool it would be to put a small speaker inside the block along with the idea of a small pager motor. To hit a start button and see engine shake and the sound come out ported exhuast would be awesome.

I doubt I will ever have a 1/6 scale tank, but maybe a 1/6 scale engine with the above add ons might be a project I could tackle.