I'm wracking my brain trying to think of a scenario in which using DNN would be a hinderance and am coming up blank.  Well, I take that back.  If you already have implementations of all the features you need so that you can just paste together code you've already written, then it might be easier to build it yourself so as to avoid having to learn how to write DNN modules and skins.  Otherwise, DNN would be an ideal framework to build upon.  It and it's core modules can probably handle most of the features you need.  If you need some feature not covered by the core you can likely find it in a third party module, free or almost free.  If in the unlikely event you can't find a module that suits your needs creating your own isn't horribly difficult if you follow the various tutorials that are out there.

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Bryan Johns
K4GDW

"There are 10 types of people. Those who understand binary and those who do not."