Our experience at the Tucson 1/2A multi-engine CL scale contests has shown that for two Norvel .061's, a wing area of around 200 to 220 sq in and a weight of around 30 oz has been successful.  Slightly smaller, say a max of 200 sq in with two TD .049's at around 25 oz also works.  Those numbers allow the model to remain airborne with only one engine running

Your weight of 37 oz is asking a lot of those Brodak .049's unless you have an area of more than 250 sq in.  Larger engines would be a solution.  How big are those 3-blade props?  Assuming they are 5" diameter, it looks like the span is around 35 or 36".  That may not give the wing area to carry that weight with the Brodak .049's.  If the span is less than 35", there will not be much area to carry that 37 oz as a scale project.  Just saying.

Nice looking model of an interesting subject.

Keith