Haven't been on the forum for quite a while, so only just caught up with your trials and tribulations. Certainly can't say you have a boring life!! But what a shame to have a failure like that on your first run out.
Truck does look good, mate, a real credit to your hard work, and most of it done on the driveway at home, not in a fancy workshop. A real well done.
Hope the donor chassis does contain something useful, and you get back on the road soon 🤞