Yes I did, very much the budget way .
I've now also added this fills in nicely the base hole I had. My base sounds great but from the back seats forward it slopes off quite bad, so at the front seat area it's about 50% down (phasing correct).
Located on the vertical part at the rear seat near the floor, sounds like it would catch you feet as you get in but it doesn't. It won't go under the seats.
Do a search on here, a few people have done various stuff, may be not on a budget level like I did.