Have spent some time on the boiler/burner system recently, hoping to test that it can work effectively in a Stephenson's configuration, with a draught from the exhaust/blower required.
The burner is a similar design to the G1MRA Dee design, scaled-up with an additional 'up-comer' for secondary air.
Having tested the burner in an open space I have now moved on to fitting the boiler so that it can be tested. I have had to re-tap some of the bushes as they were all 7/32" with 40TPI threads which made it difficult to fit 'off the shelf' components.
I found that Reeves do a nice clack
valve with a 7/32” 40TPI thread so I have bought that and fitted to the
boiler. I have also run a 5.5mm drill through the bushings for the water gauge
and the pressure gauge and successfully re-tapped these to ¼” 40TPI and fitted
the pressure gauge and just need to cut the glass for the water gauge then that
can be fitted too. Next job is to turn two adapters so I can fit Accucraft
safety valves (these have a metric 5mm fine thread). I am also making a steam manifold to
screw into the one remaining bush so that I can then fit a blower and regulator. 
Will have to flush the boiler after all that tapping as I am sure it will be full of bits of bronze...
The boiler/burner system that it is based on has some good features so the modifications you have made should work. Testing will give you a better idea of how well it performs to your expectations. Finding the Reeves components that work well with your design would certainly help to save you a lot of headache. Sometimes small things like that cause problems.
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