Do you want to try Source 2 tools before Half-Life: Alyx’s release? Well, you’re in luck! An early SDK has already been out for some games for a while now. Those are Dota 2, Destinations and SteamVR Home.
Here is how you can access Source 2 tools in SteamVR Home.
Step 1) Open SteamVR
Step 2) Select “Workshop”
Step 3) Click “Create/Modify an environment”
Step 4) Tadaa!
SteamVR Home does not include many assets. The only real assets availible are dev textures and a couple of random props. Destinations comes with a few more textures and props, so you could use that instead. Custom assets are of course still supported.
Hope this could help!