I finally got around to working on this kit the other day... Overall it is a good kit, but definitely not Tamiya. It takes a lot of work.
The main hull halves fit together well, but be very careful how you glue them. If you glue the left and right halves together tightly, the deck will not fit by about .5 to 1mm. The deck itself does not fit very well either and takes some putty both at the front, back and along the side.
Here is the back of the deck after its been sanded smooth. I had to fill around the fins also, using Tamiya Liquid Surface Primer.
The sail is problematic, as was pointed out in another build here. If you glue the left and right halves together, the top will be too wide and will overhang the sides. I glued the top to one half, making sure the side and top were flush. Then glue the opposide side in place. You will have about a .5mm to 1mm up the front and back, as the sail sides are too narrow. If you follow the kit instructions you will have a lot of fit issues. The diving planes also do not fit well and take some filling.
The front of the hull fits very well, and the windows fit well also. Unfortunately the windows are thick and oddly "hollow". If you look at the next photo you can see the funny ledge caused by the thickness of the parts. The windows are also curved although the miniature had flat windows. The curve and the thickness of the lip around the inside, and the hollow nature, make it difficult to add interior framing.
The engine pods fit pretty well. Since the seam for the fins is on the bottom face of the fin, I used some extra putty to allow for feathering in the putty.
The baffles that fit inside the engine pods are grossly undersize and do not fit properly in their grooves. Be very careful in fixing them so they come out more or less centered.
The pods fit well to the hull although I did use some Tamiya Liquid Surfacer to fill the joint lines.
I used the paper advertizment from the kit to cut templates to make a floor and ceiling for the viewing room in the sub's nose.
The main hull halves fit together well, but be very careful how you glue them. If you glue the left and right halves together tightly, the deck will not fit by about .5 to 1mm. The deck itself does not fit very well either and takes some putty both at the front, back and along the side.
Here is the back of the deck after its been sanded smooth. I had to fill around the fins also, using Tamiya Liquid Surface Primer.

The sail is problematic, as was pointed out in another build here. If you glue the left and right halves together, the top will be too wide and will overhang the sides. I glued the top to one half, making sure the side and top were flush. Then glue the opposide side in place. You will have about a .5mm to 1mm up the front and back, as the sail sides are too narrow. If you follow the kit instructions you will have a lot of fit issues. The diving planes also do not fit well and take some filling.

The front of the hull fits very well, and the windows fit well also. Unfortunately the windows are thick and oddly "hollow". If you look at the next photo you can see the funny ledge caused by the thickness of the parts. The windows are also curved although the miniature had flat windows. The curve and the thickness of the lip around the inside, and the hollow nature, make it difficult to add interior framing.

The engine pods fit pretty well. Since the seam for the fins is on the bottom face of the fin, I used some extra putty to allow for feathering in the putty.

The baffles that fit inside the engine pods are grossly undersize and do not fit properly in their grooves. Be very careful in fixing them so they come out more or less centered.
The pods fit well to the hull although I did use some Tamiya Liquid Surfacer to fill the joint lines.

I used the paper advertizment from the kit to cut templates to make a floor and ceiling for the viewing room in the sub's nose.
