It's been a long road, not sure how things became so complex, but I owe a thanks to those of you who are always quick to respond and make the advice and info available.
Looking back things were pretty straight-cut and basic, but somewhere along the line features on top of other features were incorporated into the system driven by paranoia. At least it is possible to learn from others' mistakes, so nothing to worry about if the ash tray or firebox gets left open, I will know about it soon enough.
I've made three revisions having to shut it down each time, but this time I believe, is a winner. Having 170 degree water to wash the tractor is quite a luxury. Endless hot showers nearly free of cost are cherished.
Here is a glance at the manifold, probably ho-hum to you pro guys, but certainly a design challenge for the do-it-yourselfer. I expect someone will look at this saying - why is that like that? Well, there might be a reason... maybe...
This is my solution to temperature creep during summer use - A controller operates the pair of fans forcing air into the cabinet and through the heat exchanger when boiler temp hits X degrees, it offers a slow and steady bleed off without torching the garage all of a sudden. I see that after a hot burn and the right kind of wood the creep-up is slow, but sure to happen even when every door seal is siliconed.
There is a hole cut into the upper cabinet, open the doors for normal function.
I'll post a pic of the completed control console when I get the living room cleaned up a bit. Thus far I am pleased with everything, as it pretty much takes care of itself with redundant safeties for over and under temp conditions. It is impossible to put too much load on the system that would result in damaging return temps just as having a red hot stack is also impossible. And just for the record, every electronic component is wired with a bypass switch (except the Ranco thermostat) in case of failure.