In order:
1. You decide to purchase the build
2. Get Jon's address
3. Order the parts and ship them to Jon (preferably from qualified resellers to maintain manufacturer warranties, typically Amazon and Newegg are safe, don't know about other sites)
4. I pay Paragon for his card and he ships it to Jon
5. Swift buys you Win 10?
6. Jon builds the doobly-do
7. Jon drives the doohickey to you
8. ???
9. Profit!