45 degree basement soffit / triangular soffit
Hi. Finishing my basement. all drywall is up and finished...NOW I have to build soffits to conceal ductwork. The ductwork is round flexible insulated tubing, and I am considering doing soffits at a 45 degree angle from wall to ceiling to concel them, instead of the standard "box" or "cube".
Any advise on how to construct? I know how to do the Box / cube type, but wondering do I just Mitre the 2x4's or 2x2's to a 45 degree angle on each end, then bolt to existing studs? Will I not need a typical "base" 2x4 running the length nearest the floor? Also, should I just nail or screw the ends of the mitred 2x4.s directly into the wall studs? it seems the hole going through the mitred ends may split the wood. Finall, would I want to do this with the short width of the 2x4 against the wall studs / celing studs or the "long" width ??