Yes, they are push, the pedal box is from OBP
http://www2.obp.uk.net/catalog/produ...8ba398ceda884a
5:1 ratio, takes remote adjuster.
For the gains involved from pull cylinders I don't think they would make an appreciable real world difference. Technically I admit the sideloading should be less, but then more complicated to make with more sealing which may bring the resistance back up to push cylinder levels.
As for position, I've got big feet so ergonomically they will be fine for me and I am building it for me, not an ergonomic standard. Do you have small feet?
The floor will be slightly raised to accomodate the cylinders, I am using the lowest floor position as a base (40mm lower than stock floor height) and the cylinders need 70mm so there will be a 30mm raise, but then the pedals are about that much taller than stock so floor to pedal height will not change.