The only way the Aston chassis can be used, is if it is kept in right hand drive layout. There is a structural beam running in between the driver and passenger areas, and the space on the left, the passenger side, is physically too small to get into to make it a left hand drive car. The beam is part of the chassis, and is manufactured as the rest of the chassis is manufactured in carbon fiber with aluminium core. The beam cannot be removed as it will structurally impare the integrity of the chassis, as well as invalidating the FIA crash test. Also, there are inserts in the chassis that such things as steering column, power steering unit, pedals, seat belts, kers motors and kers unit are fixed to. If you changed the car to a left hand drive, these would all have to be repositioned as well, which again, will impare the structural integrity of the chassis. Also, there is a roll hoop in front of the driver, on the right hand side, and this roll hoop is not in the left hand side, and again, this is an integral part of the chassis.
Turning the Aston chassis to left hand drive, would be possible, but it would take a redesign to move the beam, roll hoop and all the inserts. This would require new pattern work, new moulds, and then a new chassis that would be required to re pass the FIA crash test. In reality, I believe that if the Aston chassis is to be used, it will remain in right hand drive layout.