Interior Paneling Gaps

I’m working on lining my trailer interior with 1/8” Baltic birch plywood sheets. In each of the corners where sheets come together it’s difficult to get the gaps perfect and I’m looking for ideas on how to cover these gaps.
I don’t like the idea of using a quarter round wood trim as it seems kinda bulky. I’m thinking some sort of caulk but can’t find any caulk in the right color to match the birch. Any ideas?
I don’t like the idea of using a quarter round wood trim as it seems kinda bulky. I’m thinking some sort of caulk but can’t find any caulk in the right color to match the birch. Any ideas?