That's a big progress mkiii
Since you are thinking about converting your small learning project into an official WIP thread, I recommend you not to forget adding specular, normal and ambient occlusion maps to your model, as those are some of the features that make SHV objects to look more real and lively than SHIII ones. I don't know how good you are at 3D modelling and at 2D art painting, but should you need any missing any missing model and/or texture, I will be glad to help you with them, compatibly with my RL duties and with my other modding commitments.
Talking about interiors (I know it is still a bit too early to talk about them, but better to be early tha late), HanSolo78 has recently releases v 5.0 of War Ace Campaign which includes full interiors of the following u-boats:
type II by Mikhayl & Tomi_99
type IX by HanSolo78, Flakmonkey & Ubi
You could ask the authors for permissions to inlude their work into your mods. I don't think they would deny it
