Here's another R.J. MacReady custom, this time of his outfit while indoors, I.e., sans coat and with the torso of his flight suit wrapped around his waist.

Recipe: to get the look of his flight suit tied around his waist, I used the upper body of Tunnel Rat since his construct is pretty close to that look. I painted the coveralls to match the color of MacReady's flight suit.

To capture the thermal-with-rolled-sleeves-under-the-t-shirt-look, I used the lower arms of GI Joe Duke v25. I painted Duke's sleeves and Tunnel Rat's exposed upper arms to look like a thermal.

The legs are also Duke's.

As for the head, I procured that from eBay seller camarodude1967, who also painted it.