Chosen Solution
I would like to know if you can convert all 5c parts into a 6SE body
Basically, no. The mounting points for too many of the main components would be different. Not sure why someone would want to do this anyway?
The 6se doesn’t exist, so I assume you mean 5se, and no you cannot put the 5c components into a 5se casing. I understand why you would want to do it, the 5C is very plasticky and cheap feeling, but the better option here is to sell the 5c and get the 5 instead, same specs and similar look to the 5se. The 5c and 5 are very similarly priced.