Modding interior spaces

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Iambecomelife: Tried to send you a PM but your box is full.
Have a question re: interior sub graphics modifications and what is needed to accomplish that. Can use S3D for hull mods, but that's not what I want to do. And don't want to bother you experienced guys until I gain a least reasonable smarts.
I presume one needs a 3D graphics program that is integrated somehow with S3D for *.tga or *.dds to/from hex conversions, but although I have art experience, I have little or no computer graphics experience.
I think there used to be some tutorials in the forum but I can no longer find them.
If you can, give me a shove in the right direction, please.
(BTW - Philip Thomsen suggested I contact you since you have a lot of experience with this...I think he means 3D modding, not shoving... )
Thanks,
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