Hi Tom,
The barrels we used were not removable lid type. So the barrel bottom i used for the base plate has a bit of convex curve and when the J-tube is set on top it becomes flat.
@Chris,
I am planning to use fire clay to seal in the J-tube area like it's shown in the sauna rocket plans. Will my tall baffles be an issue?
Going to try and get some detailed documenting done on the project today and posted asap.
Thanks everyone!