Has anyone had a top installed on their 62-65 B-body with some minor (I think minor) modifications for the rear window and framing? The original top had the huge back soft plastic window all the way to the deck (no bottom framing). I'm looking to have a smaller window possibly hard plastic polycarbonate and framing (by the top material) along the bottom similar to the later 60's early 70's tops. Hard plastic may not be an option; but if so like to consider. Thanks.