davecymry - thank you very much for your comments and the advice mate, very helpful.
I can't wait to reach moon-buggy stage but I'm getting there (slowly
). I am a bit slow as I can't work on the car regularly, but mainly due to the lack of experience, and sometimes have to research a lot and re-think some ideas to not make silly mistakes. This slows me down and for that reason I appreciate all comments and advice. I am pleased how it is all turning out and thank you and all the other people that are helping with invaluable advice.
I was thinking about the frame reinforcement for the last few days and came to the conclusion that if I want to keep the doors, I will not be able to do much in that area.
This only leaves me with a few possibilities, and adding a prop shaft tunnel is definitely the most important one, so I will do that for sure.
I was thinking to reinforce the areas in front and behind the doors on each side, but I would not like the frame to become too heavy - now you have mentioned that the internal paneling adds quite a fair bit to the overall stiffness and the strength, which makes sense, I will first add the middle section and then see if I need to add any further reinforcements in other areas.
Cheers, Deni.