@Groutcho I have been working to get OSGeo4W64 packages of PDAL built. There are still some python issues I have yet to work out before I can build the packages, but I hope to have something in the next few weeks.
Connor has a lot more experience with point cloud 3DTiles, but I think the consensus is the spec needs a lot more work for large scale point clouds like we're doing with http://potree.entwine.io and http://speck.ly
what's there "works", but it isn't ideal at all
We are available for $upport if you want more responsiveness, btw.