So if you finish the Pipebomb Gun and the SMG you'll be finished?
Also, in the event that you make the unlockables, you should try and set up some kind of achievement Gui or something and a menu so you can switch between the weapons like in real TF2. Or atleast events for it.
Make a brick for all three
Switch main weapon
OnActivate > IfUnlockableUnlocked
VariableTrue > Player > SwitchMainWeapon > Class > Pyro (make it switch with Backburner and reg)
Variable False > Client > ChatMessage > "You haven't unlocked this weapon yet!"