vinyl corner post bottom cap/cover.

[GiantScale]

I have a few vinyl corner posts which are on the second floor and the bottoms can be seen easy. It looks like heck when able to look right up the hollow corner post seeing the house wrap and bottom edge.

How can I fill this area without glueing or riviting a piece inside?

The cornerpost has a intracate shape (not straight) so I was thinking about cutting the shape from plywood and mount to house making it a bit small so the cornerpost can slide over it when expanding.

Any other better ideas?

Thanks