U-31 on it's side gives me the best images of a VIIA for location of holes and torpedo tube shape. Notice the forward flood holes are not at all like the SH5 version of the VIIA.
U-31 also gives the best view of the deck hole pattern.
U-35 pre-war collision helps on the torpedo tube shape also. Note the extra flood holes near the saddle tanks. Both subs were built at different sites.
I've closed the upper holes near the tubes so far. I use 3dMax 2008 and Max_Retopo script to create patch panels real quick. It looks fine in Game and cut verts way down. SH5 models are not the best optimized to work with SH3 sadly. A lot of overhead and weird mate ups.
Here's the upper holes removed and a test tube for doing the torpedo thing right for the VIIA.
