Enchanting is great fun, with plenty of excellent / complicated options to choose from.
To that end, I’ve created a GoogleDoc spreadsheet to help you work out the various modifiers.
You can find it here.
It should be straight forward enough, allowing you to choose options (mostly picking from dropdown menus), whilst it then tells you the Ob and any bonus dice associated with your terrifying creation.
Feel free to experiment, and yell if anything looks weird with the numbers!