Lot of playfield restorers don't do Sys 11 machines unless Diamondplate so I'd ask. Brian/HSA do great work however I don't think he does them either.
http://www.hsapinball.com/HSA_PINBALL/SYS9SYS11.html
EDIT: It doesn't look like he will be doing any more restorations after the end of this year yet alone Sys 11.
http://www.hsapinball.com/HSA_PINBALL/Playfield_Restoration.html