If you cannot pass fully through the fuse the strength and weight advantage of tubes are lost IMHO. You might consider how Byron did the Mig in which the wings were the female side pocket of a plywood plate extension tab coming off of a fuse bulkhead around the fan. I redid a Byron MIG and remade that bulkhead former out of C/F (carbonfibre) It might be possible if that bulkhead were to be aluminum or some laminate of materials wood/c/f. You could get a wing pocket by using a combination of aluminum angle and flat stock needed to get to the desired u shape for tab insertion, I'm sure the wing pockets could be made as strong as the structure they ultimately glue too.

Actually Cermark viperjet has aluminum pockets that might by retrofitable?