Nice looking rifle! I build a machine rest once. Mine wasn't very sophisticated but it did the job. I made a remote trigger device using a syringe. I eventually got to the place where I could fire the gun from a bench using a rest bag just as well. The trigger was the tricky part with my old Lee Enfield - too stiff for bench shooting. A friend had a target rifle he was using for hunting. I kept telling him the trigger was too light and he kept saying he shoots good with it like it was. One day he had an accidental discharge (gun fired before he was ready) - then he believed me.
Anyway, mine had a thick recoil pad and a soft padded U-shaped fore-arm rest with a strap to stop the gun from jumping out the rest.