Here's an Idea:
Do you want a Armor Recovery vehicle with an open Grid Crane Boom? If the What I call Pipe style Boom doesn't melt yer Butter. Here's an alternative.
Pick the poor vehicle that has been de - turreted. Now save the turret mounting ring. Create a winchfrom a small spool drum to which you build up the ends. Or use the somewhat out of scale Bumper winch drum from Monogram's half Track!
Then, now here's where it get's interesting. Find someone who does model RailRoad layouts. See if they have one or two High Tension Electrical towers.
Cut these down to build the open grid type boom you want. Put it all together and Viola an Armor Recovery Vehicle( Heavy Duty) Mk.! Use the small return rollers from a wrecked M-4-A-1 for the sheaves on the end. Sand them as thin as possible and the glue the halves together! Mount in the small end and it's done! Now rig the cable!