Very Heavy!
1.1kg bottle does not mean its 1.1kg. It means it stores 1.1kg of Co2. The bottle is proberly about 2kg.
High Flow Rate regulator, - in a feather weight - again, VERY HEAVY! About 800g to 1.5kg. Yor 80mm bore ram 100mm stroke will be over 1.5kg. Your valve will also be over 1.5kg also. My 3/2 1/2bsp is 600g - and thats a special one i got hold of, a 5/2 will be very heavy.

Your 600g Dry Buffer tank - i bet thats 600g stored powerder, again it will weigh more.

Both RIP and FlowRate are pushing the weight limit BY ALOT already, with smaller stuff. RIP has a shell made out of 1.2mm Ti for god sake which weighes sod all for its chasiss. Rip does not even use a Buffer tank due to weight. Well also due to the high flow reg.

Also another thing - the idea of a Buffer Tank is that you dont need a high flow rate Regulator. Unless your Terrorhurtz. The idea is to have a buffer tank which fills your rams about 2 times. (FlowRates buffer tank can fill my rams 3.2 times)

Im sorrry Ian but - keep dreaming.
Using a 1.1kg Co2 bottle - u aint got a chance to start with.
Were all struggerling to fit 600g Co2 bottles in.

Message to James B - 540 is the amount of degrease it self rights - not motors.

Mr Stu