It doesn't include shipping or mounting (although, if you live in same country as me, shipping will be cheaper, obviously).

Mounting should be relatively easy (no soldering), and I could do it in price, if one want's to afford both sending old N900 to me and cost of shipping back.

Backcover is... Well, backcover replacement, in "mugen-sized" variant (for dual-cells), or normal flat-ones, both with better kickstand, etc. It will be compatible with normal N900's body (only)

Body replacement is whole N900 body (except screen module, which stays, including slider). It contains matching backcover, in either flat or fat variant (and different lock mechanism, as keeping it compatible with old body/backcovers would interfere too much with new features).
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It was all mentioned in this thread, but I understand, that it may be hard to read through all pages. When it'll become available for "regular" purchase (which is closing very rapidly, lately ), I'll update first page with all details. For now, it was about gathering ideas and funding. Feature set got hammered already, and while body replacement still needs good amount of work, backcover-only (which is going to arrive first, as announced) is at polishing stage.

/Estel