Steve. This is an early Tony Kart model ( pre 08 or 09) Maybe even older, as the side pod nerf bars go towards the front rather than on the side, it also has a welded tab at the end of the inside frame rail at the back.
Overall I think it may be a 2002 to 2008 Tony Kart Mitox, and somebody powder coated it blue, as there were no Alonso karts or Kosmic Karts back then.
Anyhow, I hope this helps, and good luck with your plans. FastFreddy. .)