Let's be honest, the RIPLEY would make a shitty engineering mech, considering the current tools that could be used in that way.
The Good:
Drill: Could be a good and fast way to take down walls, but no metal return, I believe.
Hydraulic Clamp: A nice way to store engineering materials, I'll admit.
Mounted RCD: Speaks for itself, but you ARE in a bulky mech that's not as easy to move around, compared to someone with a normal RCD. It probably costs power to use it instead of cartridges, so that is in it's favor.
Now, for the more useless ones.
Cable Layer: Only benefit, is, (I think) infinite cables. However, you're in a mech. It's bulky and hard to move around in. Bad to precisely lay cables.
Extinguisher: You need to refill it in a water tank. Perhaps it has a better capacity, but you can drag a water tank behind you. Not in a mech, unless you have it in your cargo hold with the clamp, and that's a bother.
And that's it. (From the top of my head and the wiki's, perhaps there's more, I dunno.) The current tools makes an engineering RIPLEY not that viable. Nor any mechs if they are added.