Tim,
Yes, tasks that are challenging because of a lack of equipment and space in the home garage often require "creative use of tools and equipment" ....but then a little thought can turn out results that, while not professional, are not unprofessional
Now, to ventilation. Here's another picture of the footwell with the panel sitting in position...
There is around 4'' to 5'' gap above the top of the
footrest panel that can't be seen from the passenger seat, so not a problem for ventilation.
Further venting/drainage.... as it's not a sealed area, that's not a problem in itself. I do however already have a drain hole (shielded on the underside of the chassis to prevent moisture ingress) in each footwell, main purpose being for stormwater drainage.
Keep the comments coming. I often miss a detail and have to redesign or rework a feature.
Cheers!
Glen