SENTENCE 1 :
there should be two ''is''s or sentence can be rewritten
e.g.
What my point is, is I made some changes
My point is that I made some changes ( more efficient)
Or What I am trying to say is that I made some changes
SENTENCE 2
I made the place this way.
This is correct and may mean two things depending on the stress :
"I" made the place this way -> Stress on I means it is you who made it this way
I made the place this way -> No stress -> just a piece of information that you made it THIS way rather than some other way
SENTENCE 3
I made the place what it is.
This has only one meaning which is same as the first meaning given above, that it is YOU who made the place what it is. The entire credit goes to you
Hope it is clear :)