Great Job EEFarmBoy.
I should have replied to your earlier post but the "best" way I found to bend the Logstor was....
DIG DEEP for the 90° turn coming up to your pad.
While it admittedly "cost me" more than 3-4 feet of Logstor piping, I was able to complete the turn and "pop up" right where I wanted with little to no problem because I dug down to 5 feet of depth the last 10-15 feet of the trench to the concrete pad location.
Install Note: I literally walked on the Logstor into the hole. The "back" of the hole was curve shaped through the dirt/clay in a semi-circular swing with the backhoe. The Logstor was allowed to "push" against the existing, undisturbed dirt as it bent up to vertical. Plenty of flume sand was utilized to hold the Logstor in the bottom and along the contour of the ditch. I hand tamped the flume sand every 6-8 inches and stopped about a foot shy of the finish grade. Last 1 foot was backfilled with heavy clay.
As far as your plumbing layouts, I am hoping slimjim, Scott and others will chime in.
My Portage and Main dealer pretty told me the first item to plumb to was the water heater (sidearm or plate exchanger; doesn't matter) then the HX in the plenum of the forced air system but your design does not do this.
I do not know if this is correct for every system but that is what I was told.
Can dealers and system designers chime in here?