with a jack plate and a 25 inch motor cant you just put a "filler" in the notch to bring the freeboard up? the jackplate bolts to a standard 20" transom cant you just glue core and then glass the notch, its not structual at that point. Unless the jackplate lips over the 20" notch. Most jack plates ive seen are sraight up the transom and does not roll over the transom lip unless the steering arm or other objects keep from filling in. Or am I just talking jiberish? LOL!!!!