I added the straighter grip, the target forearm, the spacers and the rubber recoil pad to my base class T1x. Also removed the "barrel spacer block" to free-float the barrel.
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The Caldwell Harris copy bipod fits the forearm just fine, probably a bit better than the original width forearm. The buttstock spacers add about 1/4" each and the rubber buttpad is 1" thick. Removing the stock buttplate and replacing it with these pieces added about 1" to the LOP. Now it's about 14 1/4" LOP, which fits me pretty good.
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It's a little tricky to install the spacers because they don't "lock in" to either the stock or the buttpad so everything is just "smashed together" as can be seen in the picture. It works, but it could definitely be improved.
I concocted the comb riser from a sheet of kydex and backed it with duct table to keep it from slipping. I simply drilled through the stock to mount it. Not fancy, but good enough for my uses.