I decided to release my tutorials and tools in both international GP4forums. I hope you understand I cannot translate everything into espanol 
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Here we go:
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A simple Excel worksheet to calculate the right size of a picture in GP4Builder
to get the right distances in game, finally. Esspecially before making a real track
it's necessary to convert an aerial photo of a track to the right size in GP4Builder.
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A guide which contains all reasons for an object not beeing displayed in game
and how to fix that with GP4Builder.
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A guide for newbies. It explains how to change the trackorder in GP4, e.g. if you
want to drive Suzuka as the 1st race of the season. The guide also explaines in
part II how to delete a defined fix .wad-name of a .dat with GP4Builder.
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.Here we go:
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You must be registered for see links
:A simple Excel worksheet to calculate the right size of a picture in GP4Builder
to get the right distances in game, finally. Esspecially before making a real track
it's necessary to convert an aerial photo of a track to the right size in GP4Builder.
-->
You must be registered for see links
-->
You must be registered for see links
':A guide which contains all reasons for an object not beeing displayed in game
and how to fix that with GP4Builder.
-->
You must be registered for see links
-->
You must be registered for see links
':A guide for newbies. It explains how to change the trackorder in GP4, e.g. if you
want to drive Suzuka as the 1st race of the season. The guide also explaines in
part II how to delete a defined fix .wad-name of a .dat with GP4Builder.
-->
You must be registered for see links
*new*