I was able to do an edit myself, it does not take that high level of skill, a random sound editor will suffice.
How the songs merge together should be evident in most cases:
TGP > TDS = like they've done plenty of times live, after "the door was wide open" they go immediately into the long note of TDS skipping the first few seconds of the song;
TDS > Root = just cut the entire intro of the song, when the song starts for "real", that's how it flows nicely from the end of TDS;
Root > Repentance = just have the first notes of Repentance starting over the very last seconds of the echo of the last note of Root, before TALW begin;
Repentance > TSF = this one I'm not sure how Portnoy intended all to be. Maybe after "the truth is the truth, and all you have to do is deal with it" he envisioned a clean start of the song the way DT played it live on the Along for the Ride tour. The sudden stop of Repentance after the last spoken word lends itself for a dramatic restart.