I'm bulding an S-170 series with flakvierling in place of the 37 mm. I pulled out the old PT-109 too, figuring that I'd slam it together as a 'warm-up'. I had forgotten why I didn't build it before... lots of work to eliminate those planked decks, replace the cheesy grab rails, replace the deck lights, scratch build depth charges & racks..... I guess for the price, I could just slam it together, but still, those beautiful, inscribed plank decks.. finally, recessed detail and they put it on the wrong ship!