I'm estimating in the 950kg (2100lb) range. It would not take much to get it below a ton, but I over-built many things with the idea of zero-failure. I've already started replacing steel parts with fabricated aluminum pieces, and will create a lightweight set of arms/uprights once the a good suspension geometry is fixed (all the adjustability in the arms is additional weight). Copper wire is heavy and I've got a lot of that to ensure proper voltage running to and from the front mounted battery (front was too light, so I had to shift some forward). Roll hoop is 1 3/4", which is heavier than required, and all the oversized rod ends with the attendant bolts adds a lot of weight. Considering its a street/track car, I can't afford a failure at the wrong time or place. So it is unnecessarily heavy, but I think it will still be fun at the target 4lb/hp.