Re: 4700 - u can call me \"Owner\"
Dan - no AC at the moment mainly due to the lack of space under the hood for the compressor and related mech stuff.  I understand that there will be a retro fit kit availabe to add AC in the future -at which time we will see.  As both the doors come completely off and front/ side windows open should have plenty of air movement for the summer - we will see.  As to the cost -it was about $3K with the additions - lights, rear wiper, elec. panel etc.  One down side is that the noise level is a little bit higher but I will live with that for the other creature comforts.  
You can look at the cab at curtiscab.com for a better idea of what it looks like.  I was orginally concerned about the visibility but have quickly decided that it is not an issue as the area that I was most concerned about seeing the front bucket is covered by the loader upright arms anyway.
G