//Template Test
//Val Definition------------------------------
val SteamCanister = <steamcraft2:ItemCanisterSteam>;
val BrassPlate = <gregtech:gt.metaitem.01:17301>;
val IronIngot = <minecraft:iron_ingot>;
val BrassIngot = <gregtech:gt.metaitem.01:11301>;
val SteelPlate = <gregtech:gt.metaitem.01:17305>;
val SteelIngot = <gregtech:gt.metaitem.01:11305>;
val WoodRotor = <IC2:itemwoodrotor>;
val SteelSprocket = <steamcraft2:ItemSteelParts:1>;
val BronzeIngot = <gregtech:gt.metaitem.01:11300>;
val SmallBronzePipe = <gregtech:gt.blockmachines:5121>;
val SmallSteelPipe = <gregtech:gt.blockmachines:5131>;
val CastIronShaft = <steamcraft2:ItemMachinePart>;
//Original Recipe Remove----------------------
//##SteamDynamics##
//Steam-Powered Jetpack
recipes.remove(<steamcraft2:ItemSteamJetpack>);
//Clockwork Mechanism
recipes.remove(<steamcraft2:ItemMachinePart:1>);
//##BrassSuit##
//Brass Chestplate
recipes.remove(<steamcraft2:ItemChestplateBrass>);
//Brass Helmet
recipes.remove(<steamcraft2:ItemHelmetBrass>);
//Brass Greaves
recipes.remove(<steamcraft2:ItemLegsBrass>);
//Brass Boots
recipes.remove(<steamcraft2:ItemBootsBrass>);
//Remove OP BrassGoggles
recipes.remove(<steamcraft2:ItemBrassGoggles>);
//Greged Recipes------------------------------
//##SteamDynamics##
//Steam-Powered Jetpack
recipes.addShaped(<steamcraft2:ItemSteamJetpack>,
[[SteamCanister, SteelPlate, SteamCanister],
[BrassIngot, SteelPlate, BrassIngot],
[WoodRotor, SteelPlate, WoodRotor]]);
//Clockwork Mechanism
recipes.addShaped(<steamcraft2:ItemMachinePart:1>,
[[CastIronShaft, BrassPlate, CastIronShaft],
[SteelSprocket, null, SteelSprocket],
[CastIronShaft, BrassPlate, CastIronShaft]]);
//##BrassSuit##
//Brass Chestplate
recipes.addShaped(<steamcraft2:ItemChestplateBrass>,
[[BrassPlate, null, BrassPlate],
[SmallBronzePipe, SmallBronzePipe, SmallBronzePipe],
[BrassPlate, SmallBronzePipe, BrassPlate]]);
//Brass Helmet
recipes.addShaped(<steamcraft2:ItemHelmetBrass>,
[[BrassPlate, SmallSteelPipe, BrassPlate],
[BrassPlate, null, BrassPlate]]);
//Brass Greaves
recipes.addShaped(<steamcraft2:ItemLegsBrass>,
[[BrassPlate, SteelPlate, BrassPlate],
[SmallBronzePipe, null, SmallBronzePipe],
[BrassPlate, null, BrassPlate]]);
//Brass Boots
recipes.addShaped(<steamcraft2:ItemBootsBrass>,
[[SmallBronzePipe, null, SmallBronzePipe],
[BrassPlate, null, BrassPlate]]);
I was really surprised to see so little interaction between Steamcraft2&Gregtech.
SC2, with some slight tweaks, could make GT steam age (which is often considered a painful transition from stone age to Electro-magical age) a much better feature to experience.
Actually I'm having quite a pleasant time with these two on my steampunk themed world.
The latest version of both mods however, doesn't seem to cooperate quite well. Some of the plates and ingots from GT5 are not recognized by SC2 and thus making some key items not craftable.
And so began my first try on minetweaker. I managed to correct the direst problems and slightly altered the crafting recipes for Brass Suit, making it steel-dependent and substantially more expensive. And I disabled the crafting recipe for brass goggles because it simply is overpowered. I added two wood rotors into the steam-powerd jetpack recipe to make it more convincing 
This is the best I can do, for now. I hope this crude script could find its way to someone who needs it.
BTW, I could really use some examples showing how to add gregtech metatools into crafting recipes.