Yes parts where second hand, mostly a factory gas setup from an old falcon panel van my father in law had. I helped him install it, over the course of one weekend, all in it cost about $100 bucks (he is a certified lpg installer) if it wasn't for that I wouldn't have done it, has I've been able to do it stupidly cheap. It runs pretty well for the most part, tank holds about 63 litres, and I get about 400-500 out of that, It is currently setup up on the lean side, power is adequate for normal day to day driving, will sit happily on 110ks but takes a little while to get to that speed, if I'm towing or have a decent load on board, I have to switch to petrol, I also switch over to petrol if I want to overtake, or enter the highway, then switch back to gas. It backfires like crap when the engine is cold and you try and push it past about 2k rpm, I either let it idle and warm up, or I just start on petrol and take off then switch to gas once engine is warmed up. Apart from the install of the fuel system, nothing else had been altered on the motor.
If you have any more questions don't hesitate to ask.