Hi BB, whilst trawling around the SB threads, I found this pic of the construction of the underside of an early (solid engine deck) Model 45. Photo courtesy of one of our forum members Deviosi As you can see the deck is bolted to the side frames, rather than welded and has reinforcing for the engine attachment bolts.
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member. Kindest Regards, Darryl