Looking good so far for the old timer. I've never built this kit but am surprised that it has an engine block by the looks of it. Would probably be easy to open the hole in the bottom of the nose to see a little of it inside when done.
As far as wing ribs in 1/48 a good tip I have read (but not tried yet) was to mask the area between the ribs, then paint the exposed rib areas with Mr. Kit Surfacer 500, which is a thick lacquer based primer that when dry can be sanded smooth level with the masking tape. When you remove the masking tape you should have perfectly scale rib tapes, which in 1/48 scale should not be very thick at all.