Hi Ernegien,
Forza Studio is coming along leaps and bounds. I had some initial noob problems but soon got over those. Everything is now working well butI have a request and I think it would be a five second fix for you (based on how quickly you rattled out the initial versions!)
.MTL files!!
I've attached a file that shows how an OBJ with MTL associated with it is different to the current OBJ.
In essence rather than it list:-
V entries
VT entries
VN entries
G (group?) reference line which lists the part name.
F entries for that part
G New part name
F entries ........ and so on.
you now get:-
mtllib material.mtl (reference the mtl file to be used)
G part name
V entries for just that part
VT entries for just that part
VN enries for just that part
usemtl materialname (taken from the MTL file)
F entries for just that part
G group (for next part)...... and the list continues as before........
The MTL file needs to just list
newmtl NAME (should be taken from the G part references)
Kd 1 1 1 (just sets the diffuse colour to white - can be this for everything)
I figured if you scanned the list of G references in your OBJ you could create an MTL and then (re)write the OBJ in the new order.
This would be amazing if you can add it in as for us 'renderers' out there its the icing on the cake to speed up conversion.
Let me know if you need any more info on MTL or OBJ structure but I think its all covered in the attachement.
Fingers crossed!

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