Thanks for the thought, there is plywood on two sides of the interior. Obviously, the other two walls are concrete block. I power nailed my 2xs into the floor, and ran the studs on the inside so they're throwing all the force __into_ the 'sill plate'. Probably overkill and highly unorthodox....but it seems very secure. (I'll post a picture of a coal covered basement floor if I screwed up...!.) I bolted 4 beam clamps to an 8" beam above and secured the studs on the top side to a 2x4 bolted, horizontally, to those clamps.... ( Don't we love it when some hardware that's been floating around the basement for 15 years [beam clamps] finds an application...!)
The other top plate is power nailed into the poured porch floor above.
StokerDon's right, I may be taking 5T in the morning, or Saturday, whatever suits their schedule. I'm OK with it, as I'm staying busy with this install...The basement is a wreck, but I'm making progress... Ordered a heap of fittings, valves and drains from Pex Supply this morning planning my DHW install. Ducts being installed next Friday, leaving me tomorrow and Sat to take care of major details and evenings next week to begin final approach.
The oil fired water heater gets the heave by Thursday night and I'll cut over to unassisted electric water heat for a few...days?? I'm planning on using the oil fired tank as a tempering tank alongside my KL and a new electric. Out of respect for my HVAC guy, I'm not doing the full DHW set up until his work is done, as the dual tank install would make it a little crowded for him. After, I'll tie in both tanks and fire it up...and keep you all peppered with questions...and a few pics...Or I'll hire that StokerDon photographer to come over, feed him and pick his brain!!!