With this frame you will not need to make any complex joints and the final product will last many years on the wall no problem.
This frame could be made from any type of wood hard or soft, it can be painted, stained or left natural each to his taste. In my opinion if you have a big wall it's nice to make different sized frames and just hang them choatic, it looks great.
Safety : When using electric tools use ears and eye protection.
Keep body parts away from sharp blades. WORK SAFE!
Step 1: Choosing frame size and glass
In my opinion it is better to adjust the frame to the glass and not the other way.