As an oldtime rocket(solid and liquid fuelled) and bomb builder,along with blasting experience- my face and fingers are still intact.
OC,as to the desirabilty of spark control, I believe the methanol vapours (possibly with some help from the catalyst)would be ignited by any spark.Thank you Rhodium for the backup.
Was thinking if one were to build a unit,there are custom plastics places all over, or have a vessel built from aluminum with seals,etc and powdercoat it with teflon.For kicks,P went to Walmart and bought a cheap air mattress inflator,jammed 4 fish tank air lines into the outlet,and sealed them in there with a glue gun.The lines were put under water in a jar, and she bubbled pretty good.Just imagine 35 cfm or more with more hoses!P doesn't think it is too complicated,just a matter of messing around with hoses and mounts.But then P used to build hydroponics set ups to sell.In next month or 2,P will build one and let you all know if and how it works.