I've released a major update to Sandpit:
https://www.moddb.com/mods/sandpit/d...s/sandpit-v401
The main change is that it's on the latest Half-Life SDK now but under the hood the Model Menu now shows items from Opposing Force if you've got it mounted and the Pose Menu now gives you a lot more flexibility (the body changer now works for all bodygroups).
Sandpit is now also based on
Basis (a project similar to Spirit of Half-Life that I've been doing on the side).
You can follow progress at
https://www.moddb.com/mods/sandpit and give it a vote for Mod DB's Mod of the Year too.