Scamming the system

I am sitting here wondering if it is possible for me to buy most of the fixtures for the remodel with my store credit card so I get 5% off and then pay my store credit card bill with my regular credit card so I can get the travel credit. Then I would cheerfully dump it on my home equity line of credit for three years because the interest rate is much lower than my mortgage and I want them both paid off in the next 5-6 years anyway.

Hm. Not sure if it possible. Hm. This might deserve some research.