WW2 platoon hex rules: Part 1: The Givens

I have some fairly large British and German 10mm armies for the 1944 WW2 Normandy campaign. They were originally organised and based for Spearhead but have never been used. I'm now planning to develop some 1 base = 1 platoon rules for use with Kallistra Hexon II terrain.

I haven't written any rules since I was a schoolboy. It's quite an exciting challenge. I'll be presenting some ideas here and would welcome feedback.

The following givens are fundamental:

• 1 base = 1 platoon.
• Suitable for armies with infantry on 30mm x 30mm and AFVs mostly on 30mm x 60mm bases.
• 100mm/4" hexed playing area.
• Playable on a table typically no larger than 6' x 4' (so it can be played at home). 
• Playable to a conclusion in 2-3 hours (so it can be played on a club evening).

Everything else is flexible.