"'reassembling' hd versions from the film" is what Star Trek: The Next Generation did with its blu-ray release, and it looks all the better for it.

Here is the reply I will give to him. I haven't emailed it yet, but I doubt he looks at this website. Besides, I would like you guys to review the message for content. In the message, do I come off as rude or condescending?

Hello Mr. Black.

Some of what you said in your email troubled me. First of all, what do you mean by stretching into 16:9? Did you really mean "stretch", or did you mean cropping to 16:9, or pillarboxing the 4:3 footage? Second, and more importantly, are you really going to just upscale the old footage instead of going straight to the 35mm source? I hope not. Assuming the best, all you would get from the unconversion is less video compression, as the size and codec of a Blu-Ray disc allow more detail to be retained than a DVD transfer. Even then, you wouldn't get any more detail out of the footage, all you would do is make it bigger. Only by going through the 35mm raw footage and creating a new 1080p or even 4k transfer from scratch would a Blu-Ray release be worth it.

Imagine that you have a blu-ray and a vhs of the same movie. Assume that both are the best that they can look and sound. Now imagine you digitize the vhs recording. You upscale the vhs. Note that no matter what you do, the vhs would never look as good as the movies DVD, let along a high definition blu-ray. I also want you to consider the fact that some reviewers of recent Magic School Bus dvd sets state that they think the quality isn't that good to begin with, I don't think upscaling the show and putting those upscales on blu-ray would be wise. You may point to the first four seasons of the new version of Doctor Who, but they have the excuse of being recorded in standard definition to begin with. As you say that the raw footage for The Magic School Bus is from 35mm film, and didn't originate from tape, that excuse doesn't work.

Basically, if you can't make a new remaster from the raw footage, you shouldn't release the series on blu-ray. I'm not trying to be mean, and if I come off that way I apologize. I also understand that you might not have the money to make a new master, and there is nothing wrong with that, but if all you are going to do is upscale the footage, releasing the series on blu-ray is not worth it.