That's true enough, but then you're stuck with an OS NV Assy and nothing else (pretty much) will fit. At least, nothing that is commonly available in your buddy's field kit. Besides, does the ratchet system work as well as Randy Smith's plastic collet setup? No, sorry, not even close.
With profile mounted engines, there's no hole to make in the fuselage. I have a few NVA that are "ratchet" and I'm not using them because of a larger hole needed in the fuselage. I only have one "ratchet" type on my profile Pathfinder.
Steve is making plenty of sense.
I have a plastic collet type NVA and I cannot remember where I got it?
I'd like to see a photo of Randy's offering. I'm convinced it would be my choice.