I hope this gets to you. I have the perfect detail for you. Worked it out talking to nudura engineer and many visits to code department. Have also had it stamped by structural engineer. Email for drawing. Have done it several times and the results can not be beat money-wise up front or heating bills long term. I need to go learn how to post pictures to the forum. Quickly, turn nudura brickledger upside down and pair with second brickledger. Web is sized for necessary footer size. Only use one more course of block. Cut interior side down floor concrete thickness. 2' of 2" insulation around outside. Backfill as nessary. Insulate interior, staple tubes down, wire mess over, pour all at once. I simplified but you get the idea. Happy to send drawing to anyone.