120y Hatch, havnt seen this one.
Heavy Comsumption of oil-
few things,
broken, damaged rings or simply sump gasket leak or even sump nut washer needs replacing.
Clutch fluid leak-
probably slave kit rubbers underneath, next to g\box or possiblly top clutch master cylinder rubers worn out.
Break fluid leaks-
Rear plunges at back,and front caliper kits need replacing, or maybe broken brake line.
The best way to check all these is to put it up on hydraulic ramp etc and carry out a proper check underneath for all these fluid leaks.
Onething about dattos, if you fairly mechanically minded, and have worked with other cars, the datto is not that difficult to work on.
One normally needs a service manual when specs, elec diagrams etc are needed, however this site, has almost everything you'll need to know about all mechanical question that you may need .
Take time to read through the TECH SECTION.