Hmmm, again I'm not to sure about the specifics of Spirit webs (looks like I have some more reading to do) but it feels like "identity" factor of gold allomancy could somehow play a part in the spirit web (by tapping into its potential maybe?) so If somehow you could invest a piece of yourself into this fabrial the way someone with Breath could invest their original breath (although I guess that's a form of investiture not ness an anchor for the spirit web) Or better yet (and yes im rambling now) create a sentient fabrial using Breath that could then have its own spirit web (does Nightblood have a spirit web, cuz I know he has a biochromatic aura)
How to use/burn the metal would prob be difficult but there has now been two different worlds where the stomach/digestion (Scadrial and Lift from WoR) is involved in the investiture so maybe it can be utilized by some sort of chemical reaction. I feel like this is the long way to say how awesome would it be to see a sentient ship that is actually a giant fabiral that can achieve FTL. Well hell, forget FTL if it can invest could you create a worldhopping ship? heheh, a worldhopping elevator
Now my mind is racing with what 'command' do you give the sentient ship? Go fast? Protect the crew?