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At 3-4mm there's very little difference between ply and hardboard. Hardboard is available in smaller sheets and it's easier to cut with a stanley knife. It's also a bit more inert.
Airhead-
Thanks re. hardboard -didn't know it came than thin. Sounds more like 'brittle board' but will take a look.
Re. chiseling - something like this? https://www.amazon.co.uk/Draper-Tools-26120-Builders-Certified/dp/B00BWR5YO2/ref=asc_df_B00BWR5YO2/?tag=googshopuk-21&linkCode=df0&hvadid=205341469171&hvpos=&hvnetw=g&hvrand=9801808503969127254&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9045311&hvtargid=pla-421904623593&psc=1&th=1&psc=1
This is an overhead which may explain more clearly?
CYOA
It'll be about 3-4m wide and a drop from concrete to floorboards of approx 2 inches at most. Though it's angled so starts at 2 inches one end, down to about an inch at the other.
Can I ask if there's any reason for hardboard over ply? Happy with whatever's most appropriate. I'd have assumed ply is more flexible/can tolerate changes in angle better?