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I've only ever used hydraulic lime (NHL), I usually mix with a ratio 3:1. If you're interested in colour matching, the resulting colour will depend largely on the sand used, and it will dry very pale until it washes out. No idea about using non hydraulic lime I'm afraid.

The idea of building a frame within the building sounds like it could work well, I'd considered building piers to sit the new floor on, but setting oak pillars into the floor and building upon that would be a great solution. I think you're right about the crumbly stone being a problem...

Evening all, Just to explain, we've got an old millhouse and I'm looking to build a new floor over the mill workings. The walls are rubble built in soft limestone/chalk. The original floor I'd like to keep as it's a great old feature however it's never going to be a decent load bearing floor...