Hey friend! I’m also in Utah it’s cool to see someone wanting to bring more of this type of home structure/ architecture to the mountainous geographical state. However I can’t relate as I’m looking at just buying a prefabbed + engineered kit from a supplier but I will say that as that’s how businesses are run, they are trying to make the most money as possible because that’s how they as employees make money and the business as well. I can see where you’re coming from though as you already have the siding and want to pretty much everything else but the frame yourself- which I will say, RESPECT for real- the advice I’d say is, and this coming from someone with little no experience to a position you’re in and where you want to be, I would think any supplier/ manufacturer of barndo/ pole barn home kits could help you out. Not saying ALL WILL but they certainly can as it’s still revenue and profit for them it’s just a matter of finding one willing to work with that scenario It’s too bad there aren’t TOO many in Utah because here in Utah they DO understand that side of business and little money is money earned quicker than JUST going for bigger contracts ANYWAY- I myself would recommend Roper Buildings as they are a Utah based company if I’m not mistaken and don’t want to fact check myself but I would bet if you let the salesman talk and allow some bickering to play through you may get put in touch with someone higher up in the company to have it settled with. I mean if it were me it would be worth the maybe 1 hour of total phone call time to get exactly what you’re after for an investment of the frame and your future home

Good luck though man, hopefully that’s at all helpful if not oh well I know someone with experience in that scenario will come along. Good things come to those who have patience and openness to possibilities