I decided that back-riveting the center rivets would be the best way to go. To do this I had to come up with a way to support the back-riveting plate high enough that the clecoes wouldn't be in the way. I ended up cutting two 18" pieces of 2x4. I rested the back-riveting plate on one of the 2x4's and then duct taped a bunch of tongue depressors to the other 2x4 in order to raise it to the same height as the other 2x4 with the plate. This worked out great. The firewall was fully supported without the clecoes hitting the workbench and the whole contraption was level. Then it was just a matter of shuffling the blocks around and back-riveting all of the firewall components together. I almost got everything done today. The rest will have to wait until tomorrow.
