Hi Simon,
Yeah, you'll need a compass repeater, engine dial and voicepipe. Have a look at this photo -
It is of U 995 after her Norwegian service. Now there may have been changes made by the Norwegians. But I don't have a photo of the "dashboard" of a wartime VIIC/41. You can see the compass repeater and engine dial are in the usual location, as on VIICs. The viocepipe is in the usual location to the starboard side (but is partially obscured by the periscope base).
Remember that a shelf was fitted to the VIICs and VIIC/41s from mid-war or so. The photos of U 377 show an example of this shelf, which was usually flat. Note there would be a hole in this shelf to allow access for the sky periscope.
The photo below is of U 993 on the 8th July 1943 -
The boat isn't finished yet. The engine dial is there. There is something where the compass repeater would usually go. The shelf on top hasn't been added yet. This is good for us as it allows us to see all the way forward to the area that would later be hidden under the shelf.
Cheers,
Dougie