Thanks for the replies and information. I've decided to use the plans Longshank posted the link to along with the simple pic's on Glynn's plans to make the guns, having spent more than i wanted buying Italeri #314 1/35th Willlys jeep & trailer, Tamiya 1/35 US Infantry figures, Tamiya 1/35th Fuel drum set and as set of Tamiya 1/35 German tank ammo loading crew to get the ammo boxes the german figures will either have their cloth hats removed with my dremel or i'll shackle them and use them as prisoners.
I did a Google search for what i wanted in 1/35th and found an Aussie online store that is a modellers treasure trove.
I have rebuilt the superstructure 3 times before finding the new square i bought from a reputable Aussie hobby tool supplier wasn't, it was actually 91.5 degrees resorted to my school tech drawing instruments and finally have it done.
Damien.