Actually,
I can shed some light on a few things...
The new Revell AG kit looks nice, a VIIC Turm II boat. I did notice in the Revell test shots that she's covered with rivets...which is simply WRONG!! Type VII boats were welded... I imagine it will be an excellent starting point for a serious Type VII build, but with a suggested retail of $21 US we can't expect the likes of the Amati kit. Comparing it to Tamiya armor kits I think will disappoint alot of folks.
It'll be relatively simple to convert the VIIC Turm II into a Turm IV (Wintergarten) with some minor work.
The Amati Type VIIB is on;y 2.1 scale feet shorter than the VIIC, so converting it into a VIIC is not a big deal. There are some subtle changes to the hull area under the saddle tanks, but it's hardly noticeable.
With regards to the 20mm Oerlikons, it is the Airfix Rescue Launch that contains the good guns. Model-Expo has this very kit on sale for $4.95 this month in their clearance flyer I just rec'd in the mail.
With regards to photoetced details, aside from creating a photoetched deck, there's not alot of parts on that boat that can be effectively replace with photoetch. Railings on U-boats are welded pipes, and PE rails will not cut it in that large a scale. I can understand replacing the periscope housing lookout platforms, adding hatch hinges and wheels, and a few other detail parts, but that's about it.
I spent 400+ hours converting the Amati kit into a Type VIIC Turm IV. You can find it in the Feature Articles section of www.modelwarships.com
Regards,
Jeff Herne
Modelwarships.com