The MP100 only runs on the LT15 track. I don't think you would have to by the LT15 head, just as many sections of track as you would need to plane your beams.

Thanks for the information, Dave. Unfortunately, buying LT15 track sections would be cost prohibitive for us. We have enough invested in our LT40HD, and I was simply hoping that the planer head might work with our [paid for] track sections.

Thanks again ...

As Dave said, it's designed/needs to run on a 2 track mill. Check into the cost before dismissing it. It's not the fastest in the world to plane all four sides, but it ain't bad. It's all a matter of perspective. The cost is far below a 4 sided beam planer. So you can say that cost is proportional to speed.