Definitely fill those gaps. The original corners had a louver style opening at the bottom as a drain point. It was aimed at the back to keep splashing out. I’d recommend having something to let water out.


Kevin
1951 Chevy 3100 work truck
Follow this saga in Project Journal
Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.