we already have jets that are somewhat modular, but it's not realy modular i think it whould be better if we had them be as modular or more modualr then the disel engines. they are kinda too big and bulky to use on smaller creations. you chould also just make them have diffrent sizes, like the modular engines have. have it be so you can still get retaion from it.
this whould be super fun and help full, sorry for bad english