Well yeah. You can always wear an A-10 bomber’s titanium bathtub that can withstand 23mm cannon fire from a Russian quad ZSU Shilka. Now that would be some feat. ;^)
It's easy if you have that magical energy source to power the suit! :)
Armor always has to be balanced against offensive payload, range, and available power. When the power source is the human metabolism, the "useful load" is very limited.
Kevlar and titanium are lighter/better than just solid steel plates, but even then there's a limit.
...and yes, I think that thing on top is the mortar baseplate.