Debi and Farmer - Thanks for showing your appreciation.
Sailor - This cylinder "eats" more air indeed, but when the press is put under pressure, it keeps it when the hand valve is set to neutral. At that point I can disconnect my modified fire extinguisher and refill it with my compressor and reconnect it. So it's not giving me any problems. Worst case scenario would be to connect it straight to the compressor, but I don't seem to have to go to that length.
Wayne - All the measurements have been posted earlier in this thread. As to the cost of the pneumatic system, a breakdown follows below (all product codes are from the SMC company):
MDDB40-200 (air cylinder) 4,100.= THB ---- 122.35 USD
VH200-02 (hand valve) 1,450.= THB ---- 43.27 USD
AR20-02BG (air regulator) 750.20 THB ---- 22.39 USD
KQ2H06-02S (one-touch fitting) 5 x 31.= THB 155.= THB ---- 4.64 USD
AS12-1F-06S(speed controller) 2 x 150.= THB 300.= THB ---- 8.95 USD
Net total 201.60 USD
VAT (7%) 14.11 USD
Grand total 215.71 USD
Hope this provides you with the information you wanted.