I just had to do this to my Minoltina AL-S to remount a loose rangefinder component, Chanyung.
To get the top plate off the Minoltina: in addition to the two screws you need to remove the winder button (hold the bottom stalk inside the camera still with a screwdriver in its forks, and twist the top counterclockwise, then unscrew it). Remove the holding ring beneath the rewind button. There are two small notches opposite each other on the ring. Fine needle nose pliers or snap ring pliers should work. Unscrew the ring counterclockwise. Once the ring is off, the top should now be loose.
Be careful as you remove the top! The shutter release button is not attached, and will come out of the top. There are also two wires routed to the top that are connected to a small resistor board on the body for the meter. Small wires - you don't want to break them. There is enough slack in them to have the top off with plenty of clearance, though.
Once you've got the top off, you can access the various glass components of the rangefinder pretty easily.
For the shutter, there is at least one other thread on this site that I've seen - search Minoltina and you'll see it under Camera repair.
Good luck! I got mine on the big auction site months ago, and finally got around to getting it up and running just yesterday. It's now ready for it's first roll of film in quite some time. Looking forward to using it - I like the feel of the thing, and its size is perfect for a carry-along.
All the best,
FreddyJ