When I've done dayglo, I've use a spray paint from a car shop. Gives a good colour, but the spray is very dusty and gets everywhere. The painted surface is dusty too, so you have to decide to clear coat it immedately if you want the slightly matt look, or rub ALL of it down carefully, because it looks very different when you rub the surface dust off.
You could pretty much do the four-seat Seahawk or Hunter by just siamesing two two-seater front ends together. If you don't want to use up two Hunter kits, another good source of a four-seater canopy is the old Revell/Monogram AD-5 Skyraider, which can be picked up very cheaply.