I'm sorry to hear that, I hope your son gets well soon...
SolrCoreAdmin functionality looks perfect and I'll be merging it shortly.
There's a problem about getting it as a NuGet package though:
SolrNet 0.4.0 is feature-frozen since the last beta. We just need to complete the documentation to release it. Hopefully I'll do it this week (any help would be greatly appreciated!). But since it's feature-frozen, SolrCoreAdmin won't go into 0.4.0.
We could release an alpha of 0.5.0 including SolrCoreAdmin right now, but it would look quite weird to have an alpha release and a beta release of a previous version at the same time.
To create the NuGet packages you can run "build.bat target=NuGet.All"
I'm open to other suggestions and solutions!
Cheers,
Mauricio