All I know is what I have read and that is not much.
If I were going to build one, I would go the 1911 route and go with the Clark set up. They are very talented Gunsmiths.
http://clarkcustomguns.com/parts-category/1911/It is my understanding that the comp is a must as it is part of the design to add mass to the slide/barrel to make the whole thing work right. Some recoil reduction would be nice also I would imagine.
Since you have the Glock, I guess that is the way you want to go. The recoil would be quite substantial I would think. I would forget about the 29 and go with the 21. With the comp it is going to be a big gun anyway and the extra barrel length would be a plus.
My suggestion would be to get familiar with what Glock kits are available and then post a question on the 10mm Forum as to what they would recommend. Being 10mm guys, most are very familiar with the Glocks and also several of them are shooting Rowlands of some kind.
There are about 4 or 5 guys that post regularly on that board that really know the workings of pistols and give very good and honest advice and are building and fitting their own pistols.
Good luck.
Added laterI thought that the Clark kit had to be fitted before I read their catalog. For $295 I am tempted to give one a try Josh.