I've completed that whole process, from shield spikes to magical enhancement to bashing with a shield. But before I get into the task you have ahead of you, I need to clarify a few things. I'm assuming the following steps are correct:
1. You created new normal weapons in the Editor called Shield Bash.
2. You copied each of your shields in the Editor with Replaces Thing Id set to the old Id (the one you have copied from).
3. You've bootstrapped each shield with the Shield Bash.
If you have done this, you should be seeing Shield Bash on your weapons tab when you have a shield equipped to the character. Assuming this is what you have done thus far.
I've left out some steps here purposely. When I put the code above for shield bashing (and using Improved Shield Bash), it was incomplete. That is on purpose, because it was meant as a starting point since what I have implemented is complex and is not easily explained. However, I will help you just to get your Shield Bash working right.
So, in the Shield Bash you have created in the Editor, set your Damage Dice to 1d3, Proficiency Required to Martial, Class to Light, Category to Melee Weapon, Critical Hit Target to 20, Critical Hit Multiplier to 2, Damage Type to Bludgeoning, check the Weapon Finesse Applies, and check Don't Allow Selection. Then add the following code at Pre-Levels/10000.
Code:
~ If we are a heavy shield, we do 1d4 damage and one handed.
if (container.tagis[ShldClass.Heavy] <> 0) then
perform delete[wMain.?]
perform delete[wClass.?]
perform delete[Helper.Finesse]
perform assign[wMain.1d4_4]
perform assign[wClass.OneHanded]
endif
This should now take care of light shields vs. heavy shields damage appropriately, which is what I think you mean by getting "bashing to work".
You can use a shield as a weapon to shield bash, but a shield is not a weapon by itself per se. Therefore, a shield bash is a shield bash, regardless of the enhancement on the shield itself. you can't use the shield enhancement bonus as a weapon enhancement bonus. If the shield is to be 'weaponized' itself, you have to add shield spikes, and enchant them separately, which is whole other can of worms.
Let's just get the shield bash working, and if you really want to get shield spikes working I'll help with that too. Shield spikes are broke currently in the d20 files, they don't work when enchanted or set to masterwork (they just error). I've made a workaround for that, but it is quite involved. So shield bash first.