Periscope hole above the drivers visor? Forgive me you lost me there. Is it in any of the shots I've posted thus far? I'll fix it just let me know what it is.
The turret bin looked right comparing it to the H/L ones I have but I will look again, perhaps I didn't look as closely as you.
This I will check too but if I remember correct its a separate piece so easily corrected.
Did I make mine incorrectly that I did? I used the H/L hull for this area as I stated.
Turret "chin"? Again I apologize you have lost me. I'm no where near the expert you are if you could possibly post a pic or 2 for me to learn from.
Mantel shape can be changed with sand paper, luckily I happen to have a bunch!

What do I need to do here?
The weld line is easily corrected thank you for pointing this out to me as I'm sure I would have missed it.
I do not plan to use the Hobby Boss mud flaps so I'm good there.
The rear air vents where exactly? Again I must apologize as I'm not sure what you are referring to.
My build uses, and please feel free to offer suggestions at any time!, the Hobby Boss road wheels, H/L upper cut out as you see in the pics, the Hobby Boss upper deck plate again as in the pics, the Hobby Boss turret, a Taigen lower hull with Taigen drive sprockets, idler wheels and early metal tracks.
The main reason in using the Hobby Boss was its road wheels, the fact that turret rotation is correct for the Tiger which is why the hulls were spliced together and the shape of the turret being correct. Now true all of these "correct" items I mentioned are said to be "correct" by members of the OTHER R/C tank forum and with my ignorance of the shape of the turret I have only their word to go off of. Have I made a terrible mess that can not be fixed and should just be thrown away or am I at least starting down the correct path? HELP!