It's a fairly simple job to make some 'wedges' to incline the seats for a more comfortable driving position. Flatlands Engineering make them for their beach buggy kits if you'd rather buy in a purpose built part -
http://www.flatlandsengineering.co.uk/fle/fle_bgkp.htm
You might find you need thinner seat bases too or your head could stick too far up into the slipstream. That would prove very blustery around the ears and, more importantly, ruin the aerodynamics...
Oh, and I reckon that the green upholstery will work with green, black, red, white, ivory or silver paint.