Davidsen,
If you are looking for some feedabck, I am happy to give you my $0.02.
First let me say that I think its amazing that you ask for feedback in order to make the perfect product! We all know how much time and effort you put it, and we thank you for it.
As far as your 6152s go, I obviously don't own a genuine 6152, so I can not tell you is your cases are the same exact size. But if you are basing them off of the RXW case, then they should be the correct size. When I see pics on Paneristi of an RXW and a gen 6512, they case looks to be the correct size.
So I would say, your case is almost perfect.
What I would change is the engraving. I like how you tried to add engraving between the strap lugs, but its is the inccorect style. So I would either change the engraving to the correct style (please see pictures) or so not engrave anything.
Crown Guard. I LOVE how you added "Brev. Ital" but the crown guard and lever is not the correct shape. The crown guard and lever is closer in shape to the PAM127. The RXWs had the correct crown guard shape.
If you can change the crown guard to PAM127 style but still have "Brev Ital" engraved, I think your 6512 would be perfect.
I like how you recreated the Heller Group engravings on the back of your 3646, but I am not so concerned about that. Its a nice historical touch, but these rngravings were done individually, by each memeber. And I believe after the war.
Italian Panerais either had no engraving, or had simple numbers and letters. Such as SMZ MM.
I would much rather see SMZ MM than a complex engraving.
I have A LOT of pictures of case backs, but here are a few:
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I think the "Russian Rolex" movement you are showing is the best one I have seen! No blue screws, nice engraving and no cotes de geneve (although they were delivered to Panerai with and without CDG).
Your vintage dials look amazing. I love how you engrave rather than print. BUT, looking more and more at the originals, I believe the words "Marina Militare" were smaller.
Lastly, I would love to see "Motres Rolex" stamped on the inside of solid backs. I think this adds more to the watch becasue it is closer to gen. I do not think this would be too difficult as current Rolex reps all have this engraving on the inside of the case back.
original:
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Pic stolen from Andrew:
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I think your plexiglass crystal and crown look perfect.
I am not concerned about things like straps because these are easlily changed. A sew on strap is correct on the 3646 and 2533, but this would be too timeconsuming to do on every watch, so it would be easier to just let people do it themselves. For those who can not or do not want to do it themselves, you can make it an option.
I hope do not take offense to what I am saying, you did ask for feeback! Thanks.