Larger shocks, I would suggest digging around a local scrapyard, because there really isn't any way to match them up by part numbers, unfortunately.
As for tires, those should be the easiest part.
Now brakes, I do not know if Tomos has any upgrade available, they are typical lined drum brakes, but the wheels from many other 'peds will fit a Tomos, so that should open up some possibilities.
As far as that bit of metal bending, I don't have many ideas, but I will warn you of one thing I've noticed about the Tomos when 40Mph is surpassed - it tends to crab left heavily, due to the unequal pull since it is a one-side chain drive, and I would highly reccommend proper chain tension and doublecheck, as well as a heavier chain if possible, some Puch chains will fit, but again, that's a mix and match.
Hope that helps some,