rFactor Modelling help?

Hi guys i am wanting to start modelling for rFactor 1 and i am using 3DS Max 2009 but first i would like to start by editing some existing mods so i have a base mod... But... I wanted to know how i can import and save .GMT files from the .Mas file. I have googled this and found that i may need GMT2 Importer tool but when i looked for it to download i couldnt find it anywhere. Also i have no clue what files i will need to make/how to make when getting the mod to work on rFactor (camera, .gen e.t.c)

If anyone can help me with thisthen it could be a big help. Thanks in advance
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