there's other issues I see....
When gluing up various length boards, end to end, they must be of common widths. Random width boards butting together will create offsets which will be difficult to work around.
To solve this, make them in 2 or 3 different widths or all the same, so when you line them up side by side there will be a continuous straight edge for the adjoining boards to mate against. Then glue them up in a large "plank" and then cut your miters. They are going to be difficult to clamp up and keep the joints "gap free".
Another issue is the boards should all be the same thickness and run through a thickness planer.
You asked if this was a crazy idea, no, but there are issues that need to be addressed.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)