Here's the one I put on my Saturn V mock up - thanks for making these parts by the way, these seem to have already doubled the possibilities from the stock parts She flew perfectly like this, if not slowly and lopsided, separation even looked kinda like the real thing (wish it were possible for the shroud to cover the engines, too!). Although there wasn't anything I could see to do with the coupler, all I had to do was enable collision for the part I wanted to connect beneath (in this case, the fuel tank). Playing with collision does seem to open alot of doors, if not for the flame broiled death setbacks it occasionally can cause