1985 technology in Docs 1955 Lab???.......Dangerous

Rating: 10/10 (17 November 2006)

Towards the end of part 1 we see Marty in the cafe writing a heartfelt letter to the doc telling him to take precautions and NOT TO OPEN UNTIL 1985! ... So OK, marty makes it back to his own reality of 1985 and he has ten minutes to save the doc before the Libyans get to him.
This is my question, Now when marty is interacting with the 1955 doc and they are working on a plan to get him home to 1985 the 1955 Doc has got the 1985 delorean in his lab!! this means the doc invents the time machine earlier then because he has ALREADY seen the finished article. Surely he would have been tempted to study the flux capacitor in more detail, asses the technology of the time circuits and Mr Fusion and even look closer at the nuclear chamber where the engine requires the 1.21GW! this means he has the basic blue prints of his 1985 timemachine sitting in his 1955 lab as the working prototype and he could have had a time machine up and running by as early as the mid to late sixties...
The whole of BTTF part one is then a paradox right!? lol