Headliner 73 Dart Sport the 1 piece one?

i think if I can i may just go the route 66dartgt went and retrofit one. 66dartgt How did this work what did you order and what did you need(i assume i will need bows?) and do they sell all this as a kit? Oh and id buy the kit and have someone that knows how to do headliners do it for me...im not one to try to do something i could totally ruin when i dont know what im doing.