Methylamine freebase is a gas, in this procedure he uses methylamine HCL, the sodium hydroxide freebases it as its added to the reaction. So yes Methylamine HCL can be used. Its all ive ever used....
it was just a normal Psuedo/Hypo/Iodine setup with a 3 thousand litre raector, the place had carbon air filters similar to those used in cannabis grow houses, also they bubbled the gas that is expelled through water which stops odours very well.