Now that you know where the fittings are located, you can actually reach them with reasonably long service hoses from the passenger side with the engine cover up. Now how are you going to determine how much refrigerant is in there?
The system does not hold much and you do not want to overcharge it.
I found the best way to do this on an Elise with the grills, is to take out the wheel liner on the passenger rear wheel. Thread the hose through the grill but reach through the wheel well to attach the connector to the A/C port. The low pressure is the rear most of the two. This allows easy reading of recharge gauge and manipulating valve and cannister.