Hi Jordan
The fittings in the BLUE circle are most logically original, link is to detail photos of hatch on my 45 HUP.
http://canadianmilitarypattern.com/H...f%20Detail.htm
Hatch
The little bent angles are keep rain being driven up along the roof and under the back edge of the canvas.
The holes in the center area of the roof RED circle are not anything that I have seen, if is located on the center line of the vehicle the I would suspect being the mounting for a light installed post war.
Cheers Phil
PS Fixed Photos so they are actually post to MLU not linked I think
The Weld with surface rust as from fixing a fatigue crack, should have drilled the end of the crack and then opened the crack up before welding.