Is that not already implemented ... the HP thing. I have seen some on these new rocks as larger assets and they have 1000HP ... but still give 2 or 3 ore when collected (so really not worth collecting unless you are desperate). I have also collected 'mini' rocks with these new models, and they also give 2 or 3 ore and they take only one shot.
Seems like I was mostly wrong on the HP / size relationship. there are some nodes that have 1000hp, but still give the same 1, 2 or 3 ores and they are not affected by size.