Yes, I built my fatbike in 2016 and it’s going strong. Talk to James at ‘BBC’ and tell him what you want, he’ll advise. If you build it a weekend workshop he’ll do a custom CAD design, or he has a range of homebuild kits, based on carbon lugs (more recently than my build which was epoxy/hemp wrapped joints.) Tandem, cargo, MTB, gravel, wheelchair, anything is possible.
(How do I attach a photo?)