I do mine old-school. I don't use remotes or alarms. On my sledd, I hid the buttons behind the mounting screw for the Yankee mirrors. Push the screw, and the door pops. All it needs is a microswitch, since I use Bosch relays. The mirror is actually attached from behind now.

For solenoids, I needed a push-type that wasn't available. I used Toyota starter solenoids with a large washer and mounting bracket welded to the business-end. The washer keeps the plunger from jumping too far. Since I can adjust the end-stop, I don't need to worry about them being too powerful.