Got this opening in the dash finished after work today, the rounded edges the Dremel left work great as a "click stop" for the vent wheels I almost used a file to square the corners but now Im leaving them rounded, pres tested before mounting evap case and good on ac side but I have a leak on water side, couldnt hear it with compressed dry nitro but with my refrig leak detector it lit up like an Xmas tree so back out with the evap unit and think Ill bench test for a leaking fitting this time