Hiding the butt joint behind the trim wouldn't be a bad idea, IMO. But I'm not an expert by any means. You'll at least want to put the joint where you can get to the back side to planish the welds.
If he doesn't weigh in soon, shoot a PM to MPandC. Robert will probably have the best advice for you.

Last edited by klhansen; 11/22/2020 9:20 PM.
Kevin
1951 Chevy 3100 work truck
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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.