Context

It would make it much easier to produce, since you can't just use the building gadget in the water without potentially messing up the coastline. I doubt it would be too OP because vanilla concrete can be made in the hydrator anyways.

I think a change in Building Gadgets renders this invalid. In v2.6.7 of the mod, the authors changed how construction paste was obtained - the new process is outlined below (copied from their changelog, obviously not all the listed machines are available in SevTech):

• Craft a construction powder block.
  • Convert the powder into a dense construction block by either placing it in the word next to water, or using one of the following machines:
    • Fluid Transposer [Thermal Expansion]
    • Hydrator [Cyclic]
    • Moistener [Forestry]
• Get paste from the block by either:
  • Breaking it, yielding 1-3 paste.
  • Using machines:
    • Convert it into dense construction chunks (1 block -> 4 chunks):
      • Pulverizer [Thermal Expansion]
      • Macerator [Industrial Craft 2]
      • Grinder [Applied Energistics 2]
      • Crusher [Mekanism]
      • Crusher [Immersive Engineering]
      • Crusher [Actually Additions]
    • Convert the chunks into paste using any of the machines listed in step 3 (1 chunk -> 1 paste).

Alright, cool. If that update is going to be in the next version, I guess I'll close this.