Hi, I'm Lubos.
In first, it is true I have no experience with Game Guru.
But I have experiences how to make assets for UDK, UE4, Unity 4 and 5, and a little for three.js.
I know wide range of mesh and images formats and I like learn new things. I'm sure I can do this and this project is interesting for me, because I like learn new things.
I look quicky on game guru and he need .obj and .ddr. I know this formats.
I have lot of work for 3-4 days and really don't have time now :-( But if you will be patient and wait few days (3-5), I can make this test project for free as proof I can do this.
Please, look at my portfolio here and also I can send you images of nice object I current work.
I use Blender, 3ds, substance painter and designer and photoshop.
Feel free to contact me for more info.
Have a nice day, Lubos.
PS: my motto: If other can do this, I must can do this too. ;-)