I have done a playfield swap on a Funhouse and Roadshow this year. Silverball Mainia has less gadgets but I believe has ground wire stapled to playfield for GI circuit. What kind of shape is your machine? When you do a playfield swap it is best for machine to be 100%. Known issues should be identified and either fixed or have parts ready for playfield swap. Take a few pictures of top and bottom of playfield. I might be willing to do and give you back at Pinfest.