Bridge Crane to Gantry?

[NortonDommi]

I am not kind to myself, having an enormous amount to do just having a major cleanup and then I make an impulse buy of more potentially useful stuff.
I spotted this on a local auction site and told a friend about it for a workshop he is building to house his excavator and tractors and he then forgot about it. Came down to the last two minutes and I threw a bid on then the war started. I have a very limited budget but calculated that I could eat porridge for a few weeks and pad the dogs steak with rice on the side so came up with a figure, bid and turned the computer off.
Got busy but when I checked a few days later found I'd won. In U.S. Dollars $100.06
It had been sitting in a yard for a couple of years and the trolley was seized up so I painted some Emertan rust converter around and next day followed it with some home-brew penetrating fluid. Came back a couple of hours later and less than 10 minutes with a bar had the trolley rolling freely by hand, made my day.
The penetrating fluid I mix up is 1:1:1 Kerosene: ATF: Diesel and as I was at the end of a bottle of semi-synthetic two-stroke oil I added some of that too, I think there is a noticeable difference. I'll have to tu-tu with it a bit but thinking that I'll keep the 1:1:1 ratio with the ATF,Diesel,and 2-stroke oil and up the Kerosene to 1.5 or 2 parts.

Although I would love to erect some rails and use it as a bridge crane over what is left of my driveway I am thinking converting it to a gantry crane would be quicker and cheaper as there ain't a lot of A45 crane rail going cheap at the local scrapyard.
Length is 2940 mm, width 1000, height 640 mm.