As you have planned to add methane and other stuff as liquids...
Although i know you don't like BuildCrash (as you call it) much... many people do use it, for other mods like RC and TE. GT integration also would be nice.
Also newest Thermal expansion has liquiducts, a very nice liquid tubing, better than BC ones.
Suggestion for Liquids :
Allow Translocators/Buffers to move liquids (Gui option to move only liquids), make all GT machinery which uses water/lava (or any other liquid) have internal liquid tank,
New Generator : Liquid fuel generator, which effectively burns any (compatible) liquid that goes in it , with a nice output of 100 EU/t.
AFAIK, Ind. Electrolyzer and Grinder have internal water tank and Ind. Centrifuge has internal lava tank..