[ascjim]

That looks great! I need something like that

[Smurf]

James, I gave some info previously in this post on a UK supplier to buy the metering ball valves separately. Therefore it should not be that difficult for diy minded folk to knock one up at a fraction of the cost. I was also informed that UK metering ball valve works better than the yank branded valves due to the nature of the inside workings of the metering valve itself.

[ascjim]

Have you manged to build one?

[Paul Doig]

Just saw this, someone in the US has made a homemade version:
https://www.youtube.com/watch?v=m5h6GSPY9mM

A few more valves, but made to suit his purpose.

Another one:
https://www.youtube.com/watch?v=LMstJgN_8yc