Since it'll probably come up: can Sif's body be repaired into decent-enough condition, or will we have to find a replacement head?
If it's the latter, would a lvl.2 deep sea ball (deep 2/smooth 4/Organic 4) suffice?
Oh, you better not. I've spent the whole game trying to get out of that body, and you have plenty of time to obtain a superior one. Just take some otherwise worthless storeroom metal and make something out of that, and then use all the wonderful tags contained within the human body for whatever. That way, it's a win-win.
Lucky me then that you're in no position to make demands, mr. disembodied ghost
But seriously, given the deep sea heat level there is right now I don't think it'll take all that long before something tries to eat your soul (or attack mine while working). Moreover, there's other things that I already promised people I'd help with (building reinforced suits to send backup down, build those clawgloves, a still to prevent Verne from falling apart, to name a few), and if I put you into a patched-up body now there's nothing preventing us from then transferring you again later. That'll also give us (or Engie, should he return) the time to construct a really good body instead of rushing things now.
Finally, did Sif ever mention his wish for a better body to Joshua in-game? I know you've mentioned it before, but I'm unsure if my character was ever around to hear that.
FAKEDIT: wait, didn't midjag try to build a terminator at one point? Might have been during the old build system though, so he probably didn't finish it.