I am just about done with my 1/72 scale Schnellboot. It is a vacuformed hull and bridge. It has a single shaft and rudder and it turns very tight. One single shot 1/4" torpedo gun with two balls that shoots great using a bike pump to fill and I think this will be a fun boat for about $100 with radio.
Sorry it is not. I was trying come up with a very affordable boat but I am no longer with the 1/72 group and I have gutted the boat for my 1/144 Type IX sub that is almost complete.