Here's what I was thinking for an insert that replaces the ren-board blocks. It would straddle the delrin blocks that the masts are stepped onto and would be as long as possible while allowing clearance for all parts. Travel distance as drawn is approx. 75mm (3 inches). Can be increased by lengthening the track openings. I think my winches are too big diameter.
1- formed aluminum piece with mounting points and tracks milled into it
2- Delrin servo sliders (X4) These are what capture the drum servos into the tracks
3- Eyebolt (X2) fasten upside-down so the ey sits below the top of the insert) OR Spring simply hooks through hole at top eliminating the need for eyebolts.
4- Spring (X2) fasten to delrin slider on one end and eyebolt on the other
the sides of the insert could be a nice place to neatly mount other electronics. In my case, possible switches for the gun ignition.
Assembly is simple and the whole assembly can be removed for servicing(if needed)
Had to get it out of my system.
Will happily keep you up to date on any gun development.