Looks very do-able. Do you have the backglass?
Someone out there should have a backglass for that game, or you can check out bgresto.com. http://bgresto.com/?p=1101 The playfield glass is easy, and you should be able to find a lockdown bar fairly easily. I guess you can get all that stuff afterwards. Get the game cleaned up, rerubbered and working first. Good luck. We're here for any support you might need.
"Happy Clown" was a transitional game for Gottlieb. During the run, they switched from the "beehive" style shooter bezel to the flat metal rhomboid style, and changed to the thicker diameter ball push-up rod (same diameter as the shooter rod). Yours appears to be an earlier one with the beehive and the thinner push-up rod.
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