The X-28A AIR SKIMMER single seat sole prototype by George Pereira was purchased by the US Navy in 1971 to study the potential of a small seaplane for civil police work in southeast Asia.
Don't you mean George Pereira's OSPREY I (different from the X-28A)? There is a much improved GP3 OSPREY II two-place amphibian. Why not build the latest, improved version OSPREY II?. I have photos of the OSPREY II here. Look at N220DW. The OSPREYs were designed for operation from enclosed waters.
Experimental aircraft instrument panels are usually customized to the builder-pilot's requirement-VFR or IFR, steam gauges or glass panel. Best to design your own-there are computer programs for that.