Just a little update, spent most of the day finding a (finally) suitable rubber material to make the valves out of (a big flat soft rubber washer originally intended to seal a toilet cistern) all I've done since is add another thin perspex layer to the assembly (this will house the valves among other things) and cut out the end intakes of the pumps original impeller chambers, they have a little cleaning up to do before their ready to fit (in the next layer that's yet to be cut out)
Think I have enough clamps?
