i just cut off the pipe about an inch from the block flange on the pass side then pinched it together, beat it down and welded the seem, never had any issues with it.
i just tacked some tabs on the edge of a flat panel that i cut a little smaller then the opening. Starting at the center, just sort of spiraled out pushing the tabs flush as I tacked it in place. The roof is mostly flat where the sunroof is.
Been busy with life, just now getting back dipity. Put some RCVs in the front axle, got the engine/6l80/t-case installed. did some sanding on The firewall/ underside and started on the sunroof delete.
Second that. have bought several chairs from the office stores that all had issues in a short time. went to an legit office supply and got a HM chair.
do yourself a favor and get a glass mat. trust me worth the money, plastic mats sucks. ...