GDI+ Isometric engine

I need an isometric engine written in .NET. The engine map must be broken down into sectors so that the render loop doesn't traverse the entire map. Also, I need the grid broken down into navigation cells. which would be be roughly half the size of an isometric tile. The render method must be diamond rather than staggered as pictured in the included image. I have included an additional image that shows the isometric tiles (green with black border) with a navigation overlay (white bordered). I have also included several isometric tiles. I cannot stress enough, DO NOT loop through the entire map. Determine the current sector and render those tile only is they are in the current viewpoint. Otherwise, if the map is huge, the performance will suffer greatly. If you do a good job. There will be more work for you on this project. Thanks. Also: Please only bid if you have experience with game development. Please give a brief description on why you should be awarded the project. Thanks.