Do you have any of the original curves used for constructing this model?

If you can post them, it may help me to give some tips on some more robust construction techniques, like trying to build larger surfaces rather than a lot of little slivered pieces or some stuff like that.

Try to build some pieces larger than you need initially, with fillets applied for the rounded edges, then slice away excess material with a boolean, rather than going around trying to fill in one little patch at a time.

- Michael