If I may... In my view, the only proper way to do this is with the Extended Blu-Ray, no other sources, keeping it spread across two blu-rays.
And for me, TTT and ROTK are fine. They are not correct to the original theatrical releases, but they are correct to the special marathon run digital release, which I saw. LOTR was not correct. That BD is clearly screwed up. Something went wrong in the process of crating that encode.