Ron Perrott has indicated that subject to sufficient interest he may be persuaded to produce a limited run of modules for the Moebius/Revell 1:72 scale Skipjack kit.
This is a one off opportunity, the modules will not be produced to order, just one batch.
The modules feature twin piston tanks, and would come come complete with a separate motor cylinder for drive. I have seen these modules in operation in other boats, and they work very well indeed.
The projected price is £300, postage would be on top of this. If you're interested please reply to this thread or PM me your details.