After much deliberation and consideration I have decided to go with a much more conventional approach, sticking my feet out. It will take some minor modification, and the return of some parts but it will save weight, money, complexity and time. Getting my seat in place and the frame started allowed me to make a more accurate assessment of the feasibility of the feet down approach, and it looks good.
Where my feet stick through, I will have little doors that spring shut. The diagnal supports by my knees will need to be moved back to make room for leg swing. I well rounded edge on the bottom of the door should prevent my foot from catching hopefully.
Thanks again for all of your comments, they have been very helpful in the decision making process.
