I need to build a trailer for a 28. The boat is in a lake where there are no facilities for lifting her out, must be floated onto a trailer. I have no dimensioned drawings of the hull to allow me to locate the supports and the keel guide. Any drawings of the hull, or drawings of a matching trailer would be greatly appreciated. I have a flatbed trailer suitable for the weight, and intend to build removable supports with adjustable heights, but I need to know approximately how high to make them. Also the keel guide and bow support need to be located properly to avoid damage when first pulling out of the water. The keel is a torpedo like bulb with small winglets on the back. The lake is drying up and I must remove the boat.