My Xtracycle is in pieces

A while back I disassembled my beloved Xtracycle. Below was the last rendition of the bike.

I’ve since used the red Ibex frame as my off road single speed. I had stopped using the Xtracycle because I was testing out the Torker Cargo T. As great as the Cargo T is, I missed how much load I could carry on the Xtra.

Well, now that I’m really missing this rig, I’m thinking about how I could assemble it again. But I wanted to make it different this time around. I have my old Gary Fisher Tarpon: it’s a steel frame, the color scheme on it matches the Xtracycle, plus I have a Nuvinci rear wheel that could be mated with the setup.

What do you think should I go with — the steel GF or should I look for an aluminum frame?