Replace Firewall or Patch?

I've got a 66 vert I'm restoring that has some pretty major rust issues. I've recently cut out the cowl and need to replace upper and lower cowl and side panels. The firewall has rust on both outer ends that will need to be patched and the rust thru on driverside floor has moved up pretty high on driver side to around the steering column hole. Little new to metal work (although this is my second cowl replacement and it does not get any easier). I am debating if I should just replace full firewall or patch.

I've already bought the firewall even though they make patches for areas I need. By the time I add up the individual pieces it's not that much more cost plus driver side patch did not appear to go up as high as I needed it.

Just looking for some advice from anyone that has replaced the firewall and how big of a job it was. Also concerend about how to support the car thru the process.

I can try posting some pics if that would help. Any advice would be appreciated.

thanks