In my opinion, the most accurate of all the models of the Gunbuster would be the SHE figure. But at $500 I am not putting mine together as it is so fragile I'm afraid I'll break it. Those guys over at SHE did such a wonderful job with the design and moulding. You can tell they put a lot of work into it. Second would be the Soul Of Chogokin toy, but being as it's just that, a toy, it's kind of bulky in places to allow for the transformation. I would also say that maybe General Products original resin kit would be accurate, because afterall they did the design work on the mecha being as they were the modelling arm of Gainax in its infancy.
As for those interested, the Science Lesson page is up. Will have to work on it, and I am not super-deforming myself. God knows my eating habit has already done that to me. Please be patient and allow all videos to load. Sorry if your connection speeds are slow for some of you, but I wanted these things high quality. And don't ask me why I used Quicktime format. I couldn't get multiple flash videos to work for some reason.
Linky thing: http://www.toponeraegunbuster.com/Gunbuste...ce-Lessons.html