The newer versions of the Acrobat reader will now let you select and copy text from PDF files. It will still require some work, but this should make what you're trying to do much easier.
Trust me on this - it won't. :(
I've been trying to convert a RouterOS PDF to Word, and the formatting becomes complete and utter crap.
Not all of it ofcourse. Most of it is decently formatted, but you would have to spend hours on hours to "fix" the remaining formatting to make it usable - especially in a tender.
My best tip is to convert what you need for your tender and leave the rest. If your customer asks for more you can always fix that later. ;)
There are only 10 types of people in the world: Those who understand binary, and those who don't.