Just got it and ran the build.  This error caused the build to fail:

  addons\assetplacer\assetPalette\AssetPalette.cs(641,15): error CS0029: Cannot implicitly convert type 'Godot.MeshInstance3D' to 'Node3D' 

Hello @fatoldyeti, may I ask what version of Godot you are running it on?

Absolutely, should have thought of that.

v4.2.1.stable.mono.official [b09f793f5]

Ok, since this error is clearly not supposed to happen, may I ask you also tell me the version of .NET, and the contents of your .csproj file? I am not sure, but it may help to go into your project folder, go into the .godot folder and delete the "mono" folder inside. After that, try if recompiling fixes the issue. Please also check if there is only one assetplacer copy in your project, and that it is where it is supposed to be.

Played a bit with the project and got it all working.  Something on my box wouldn't clean itself.  Once I got it all cleared, it compiled fine.

Thanks!

Great to hear, and sorry that it took so long, these things are hard to figure out sometimes :)

Happy developing!