If you're looking to do upgrade parts for tanks, the most important tools you will want are a set of calipers and a bevel. Getting the angles right and the measurements precise are very important.
I haven't any background with Solidworks so I can't give tutorials there. The big thing is to find the basic modeling tutorials, look at guides for building any number of things and try adapting the techniques and experiment with them to see what you can do.
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