Totally understandable. I remember how tentative I was when I first drilled a hole in my 8" Newt for its secondary dew heater wire, I was having heart palpitations. However, I guess once I got past that, I stopped worrying, and bought this OTA with the full intention of "Frankensteining" it if necessary.
It's a shame that was needed to get the most from it, but I can totally understand why this Newt was built like this. It was to allow plenty of in-travel for DSLR users. Unfortunately, that makes it less than optimal when using a coma corrector and cooled camera.
The fact that the spider and focuser are so far down the tube is curious, though. It's almost as if they intended to allow users to do this kind of mod. The previous version didn't have this, and users ended up needing to do things like add extra tube to the back end of the OTA.
What is the "blocked" collimation? Perhaps you could make a post about this and we could try to assist?
Mine can focus not a problem, i tested only once on Veil Nebula and it was in focus, with the stock focuser, i was planning to change all Newt focusers i have, i did with my 8" F/5 first, and not yet with 6" as i don't know which affordable good focuser to buy for it.
I called it a blocked collimation because i explained it so many times in another sites or groups or topics that with the secondary mirror and maybe spider vanes whenever i use the screws or the knobs [Bob's knobs after i installed them] i can't keep collimation or make it proper, to explain it more, there are three knobs, only two from any direction is only working, so whenever i adjust two of them, once i use the third for fine tune it ruins the other two knobs adjustments, this never happen with my 8" Newt, using exactly the same collimator, so i think either the secondary has a problem or its holder or something else i can't think of.
This scope is amazing once it will work, and if i buy a reducer for it i can go faster then i can have nice data, sure i will face issues with it until it is done, but i will never modify it with drills or cutting.