I haven't been to Thomas or Hatchet specifically, but I have been through Moose Lake and Snowbank, so I can speak about those areas.

Are you planning on going through Knife or Ensign? We went to Knife Lake. The only issue to watch out for are the portages between Seed and Knife Lakes. I think most maps only show one portage between Seed and Knife. There are actually two. There is a small pond between Seed and Knife that you will have to unload at and reload at the other side. Stop by and see bacon rock and other artifacts on the Isle of Pine (Dorothy's Island). There are a few nice campsites on the western end of Knife (I can't speak for anything further east of Robbins Island).

We went through Snowbank and stayed on Jordan. There is a nice sandy beach campsite on Jordan - the one furthest north. We stayed at the southern one, which was also nice. We had horrible luck fishing on Jordan, but we caught a lot of northerns on Three Eagle (just a short bushwhack through the woods to the north).

I don't remember any of the portages in either area being too difficult. Our two trip reports:

All of our campsite reviews are on the map or the campsite database.