Right, the plan is to use 6061 aluminium rod, 1 1.4inch diameter and turn this up to fit the bulkhead female fittings using orings. A thread on the end of these will take a plate retained with an12 nuts and use the spring steel retaining clip from original. 90 degree fittings with AN12 to hose barbs using 19mm original (cut off) or replacement hose.
Will use CAD to design and have a friend / acquaintance who has a CNC lathe and can turn these up, then just assemble.
Keep you posted. Meanwhile Mackey bypass hose ordered. Car does not run otherwise.
There might be a market for this.... Nice.