I had the same questions...the quick answer is you can use the old SE board info. If I'm wrong, someone should correct me.
What I did was read the TSE forums and the Tubelab website. From what I've gleaned from the two is that one or mores solid state devices became obsolete. Otherwise the mod I and mod II boards are the same.
Mr. Tubelab usually will respond to questions on the Tubelab forum here within a day or two. From what I've read, he has had quite a few life changes the past few years and hasn't had time to write the TSE-II assembly manual and parts list.
However, there is a spreadsheet posted with all the parts you can click on and it will give you all the parts from Mouser. Search for TSE-II parts. I just ordered all my parts for a TSE-II board. All the parts listed are available, and all you have to do is click on the link.