Good thought. Don't know yet. I think the seat base is stock, so suspect not. Mrs Box'a'bits would be ecstatic if we could make it work though...Me, not so much. Weight may be an issue. I've just spent a fascinating couple of hrs figuring out how the supplied mounts work on this thing. I have been studying the trade me photos, & assembling based on marks in paint & dirt. I have a spare very corroded swan neck, which I think may connect the flat bar subframe to the bike's frame, under the swing-arm? The mounts (in total) once again weigh a shit tonne, but rely totally on the bikes frame for strength. I'll use them to start with. My early flat bar attempts at a subframe seem advanced comparatively, and the current subframe & mounts on the Velorex are light years ahead in pure engineering terms. The new sidecar is still sitting on the trailer looking forlorn... Post script: Just re-looked at this. Yes I could easily lower the seat. The PO raised it for kiddie transport purposes.