How do you improve PzB???

[Dog Soldier]

Another issue is the all round fire from bunkers, these should have a facing so that they can be outflanked. At present they fire through 360 degrees.

I think I can address this aspect as PzB being more similar to PzC scale that to SB scale.

Any fortification in a single hex does on represent a single structure, but multiple structures. Some could be unmanned if one thinks about an entire company in the hex and only a single platoon both receiving a full benefit. Movement between them is beyond the scope of the game scale, but you can see what I am thinking goes on inside a hex.
If one stacks more troops than 1/2 of the stacking limit, the over stacking penalty still applies, reducing the benefit from the fortification until less than 1/2 of the stacking limit is again present in the hex.

This multiple structure concept within a hex works well in a battle like Kursk where the Soviets had ample time to prepare their defensive works. The Soviets did not use a linear defensive posture for their formations having learned the painful lessons of 1941-42 about linear defense and the German point of attack then spread out tactics. While described in books a s three main belts, the defensive works at Kursk were not linear (except in films where linear makes filming and framing easier).

Overlapping fields of fire and positioning the fortifications for all around defense would be common. The Soviets learned some these things from the Finnish Mannerheim line fortifications. Some they developed themselves.

I think the game models this well with a minimum of extra rules and conditions. Isolation is still possible for units in fortified hexes which simulates 'flanking'.

Dog Soldier