Personally, I wouldn't go any lighter for what I use it for but your needs may be completely different. If you are going to use it just for travelling on relatively flat terrain, strong connections aren't required. And I'm planning on doing some of that this winter. So far I've only used mine on hut trips where I'm hauling 50-60 pounds up (I've had over 100 lbs on it for a short duration) and skiing down with 40+ pounds. And skiing pretty aggressively at times to gain and maintain speed when a flat stretch is coming up. I even crashed it while doing this when someone suddenly came out of the trees in front of me. I thought I'd probably snap a pole but they are really tough.
The sled itself is listed at 5 pounds. Mine is 6.5 including the mounting hardware, 3 straps, 2 removable metal fins (used when skiing to keep the sled tracking behind you), a couple of snap lock carabiners, and a plastic chain brake with with some light rope and an S hook to attach the brake lead to my waist belt. The fiberglass poles are 2.5 lbs with the attachment hardware.
So you can go considerably lighter depending on how you will use it. I'll be looking forward to see what you come up with.