As it's pouring down spent the morning drawing up and printing bits to assemble my Pulsed smoker into the Boiler. Printed a mount for the decoder and a spacer for the smoker so there is a space between the Lead weight and the fan unit, only running it will tell if the air gap is big enough for it to get enough air.
then printed a tube that joins the original LGB stack to the smoker top ring, instead of trying to use bits of plastic tubing, odd that the black bit that sits on top of the boiler is not joined to it just pushes into it.
Smoker now screwed down to the Lead weight, so it can't move any where, the printed tube then joins the original stack to the Smoker.
And it Fits
... The LGB stack pushes into the boiler from the top and over the tube I printed, then it turns and has locking taps on it , so as you push it in and turn it to lock it in place it closes the gap between the smoker and the bottom of the stack so in theory it should not leak
Now need to cut a bit of the Lead weight away at the front only to allow the cylinder smoke tubes to fit. I also need to find some new plug together connectors to join all the front lights back to the decoder as they have too be joined at the front of the boiler after it's all been assembled.