is this still going? RussiaGhost seemed to be making good headway in progress
I am much more experienced in modelling and skinning, however i will have to learn all the tagging and lighting paramters or pass the geometry and textures off to someone, but can build very Top-Notch Maps.
Welcome to GR.net.
The maximum texture size in Original Ghost Recon is 2048 pixels x 2048 pixels. I know nothing about making maps so I can't help in that regard.
There is a Photoshop plugin available for .rsb's which is the format used in OGR. MediaFire link: http://www.mediafire.com/file/li5056t5uw62ord/RSB.8bi/file
Other utilities are the Lighting Tool and RSB Editor which are on the Island Thunder disc.
Link to OGR Map Modding: http://www.ghostrecon.net/forums/index.php?/forum/13-gr-map-modding/
Good Luck! Edit: The rsb plugin works better on older versions of PhotoShop. I use and old version, CS2, which works put sometimes part of the interface or files being worked on disappear. They will reappear if you click on the screen. Just an annoyance. Not familiar with newer versions of Photoshop and the functionality of the rsb plugin.