Double sided tape them in
We made a rocket powers cougar back in the early 90s we made an Alu angle with a d size rocket engin jubilee clipped to the plate then the plate bolted in on the original gearbox fixing a small Rx pack up front to power receiver and servo and a rocket egnigter to shoot this thing across our local playing field. It was all good until the back blast blew the rear bulkhead to bits great fun tho
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