Personally, I love a good Eleanor. I've only ever seen one on the road around my city in the last 10 years. But as already mentioned, doing one properly WILL set you back around $100k.
Sure, some enthusiasts will frown upon them, saying they're 'destroying a perfectly good fastback', but it's rare to see a completed one go for less than $80k these days. She cops a fair bit of flack amongst Mustang fans, I've noticed.
Have you been following Cameron's site, 67mustangblog.com..?? He's had his off the road for over 5 years, doing a very thorough job of his Eleanor. He would be able to vouch for the pain involved with building one.
My suggestion... make friends with a good panel beater/fibreglass kit fitter NOW!! Huge money involved in that stage, apparently.
Good luck with what ever you decide to go with.