Необходимые реагенты (в скобках примерная цена на АН):
50 Rough Stones (40s)
86 Copper Bars (5g85s)
40 Linen Cloth (1g)
30 Coarse Stone (2g)
135 Bronze Bar (11g)
60 Wool Cloth (3g)
20 Silver Bars (1g50s)
40 Weak Flux (Vendor) (35s)
20 Heavy Stone (1g)
20 Medium Leather (30s)
20 Gold Bar (4g)
40 Iron Bar (3g)
40 Solid Stone (3g)
40 Heavy Leather (2g)
160 Mithril Bar (24g)
20 Mageweave (1.5g)
100 Dense Stone (7g)
200 Thorium Bars (40-50g)
140 Runecloth (15g)

Итого: ~125g

В Оргримаре:

1 ) от 0 да 30 из Rough stones делаем "Rough Blasting Powder" (1x Rough Stone)
2 ) до 50 - "Handful of Copper Bolts"(1x Copper Bar)
3 ) делаем Arclight Spanner (6 Copper Bar)
4 ) до 65 - "Copper Tubes" (2x Copper Bar, 1 Weak Flux (Vendor))
5 ) до 75 - "Copper Modulator" (2 Copper Bolts, 1 Copper bar, 2 Linen Cloth)
6 ) до 85 - "Coarse Blasting Powder" (1x Coarse Stone)
7 ) до 90 -"Advanced Target Dummy" (1x Copper Modulator, 2 Copper Bolts, 1 Bronze Bar, 1 Wool Cloth)
8 ) до 105 -Silver Contacts (1x Silver Bar)
9 ) до 125 -"Bronze Tubes" (2x Bronze Bar, Weak Flux) и "Large Copper Bombs" (3x Copper Bar, 4x Coarse Blasting Powder, Silver Contact)
10 ) до 145 -"Heavy Blasting Powder" (1x Heavy Stone) или Whirring Bronze Gizmos (2x BRonze Bar, 1x Wo0l Cloth)
11 ) до 155 - "Bronze Framework" (2x Bronze Bar, 1 Medium Leather, 1 Wool Cloth)
12 ) до 160 - "Gold Power Core" (1x Gold Bar)
13 ) до 175 -"Iron Struts" (2x Iron Bar)
14 ) до 185 -"Gyrochronatom" (1X Iron Bar, 1x Gold Power Core) and "Solid Blasting Powder" (2x Solid Stone)
15 ) до 195 - "Advanced Target Dummy" (1x Iron Strut, 1x Bronze Framework, 1x Gyrochronatom, 4x Heavy Leather) - сохряняем их ради пружинок для repairbot
16 ) до 205 - "Mithril Tube" (3x Mithril Bar)
17 ) да 215 with "Unstable Trigger" (1x Mithril Bar, 1 Mageweave, 1 Solid Blasting Powder")

Идем в Гадгеджан к тренеру и обратно в Оргримар. .

18 ) до 235 - "Mithril Casing" (3x Mithril Bar) and "Mithril Frag Bomb" (1x Mithril Casing, 1x Unstable Trigger, 1x Solid Blasting Powder)
19 ) до 250 - "Hi-Explosive Bomb" (2x Mithril Casing, 1 Unstable Trigger, 2x Solid Blasting Powder)
20 ) до 260 - "Dense Blasting Powder" (2x Dense Stone)

Покупаем рецепты Thorium Grenade и Thorium Widget у вендора в домике инженеров в Оргримаре.
Дальше поднимаем скилл до 300 с помощью Thorium Grenade или Thorium Widget

Engineering 300 - 375

Engineering 300 to 375 Guide by Highlander on EU-Terenas

300 - 310
Your going to need 40 x Fel Iron Casing, 60 x Handful of Fel Iron Bolts and 45 x Elemental Blasting Powder, so just make all that first and you'll get to 310+.

310 - 320
Fel Iron Bomb (1 x Fel Iron Casing (3 x Fel Iron Bars), 2 x Handful of Fel Iron Bolts (1 x Fel Iron Bar) 1 x Elemental Blasting Powder(1 x Mote of Fire, 1 x Mote of Earth)) x 10

320 - 335
Fel Iron Musket (2 x Thorium Tubes (12 x Thorium Bars), 3 x Fel Iron Casing (9 x Fel Iron Bar), 4 x Handful of Fel Iron Bolts (4 x Fel Iron Bars) x 15

335 - 350
White Smoke Flare (1 x Netherweave Cloth), 1 x Elemental Blasting Powder (1 x Mote of Fire, 1 x Mote of Earth)) x 25

350 - 355
Hardened Adamantite Tube (3 x Hardened Adamantite Bar) x 15 (the extra 10 are for making Khorium Scopes, if your planning to get to 375 without making them or Felsteel Boomsticks, then you are better off making Adamantite Rifles)

355 - 360
Felsteel Stabilizer (2 x Felsteel Bar) x 5
It's a limited supply recipe, sold by Qiff in Area 52 in Netherstorm.

Preferred option:
360 - 375
Khorium Scope (1 x Hardened Adamantite Tube (3 x Hardened Adamantite Bar), 4 x Khorium Bar, 2 x Dawnstone) x 15
It's a low drop rate recipe off of Sunfury Bowmen in Netherstorm.

Alternative options:
360 - 375
Felsteel Boomstick (1 x Hardened Adamantite Tube (3 x Hardened Adamantite Bar), 4 x Felsteel Stabilizer, 4 x Handful of Fel Iron Bolts) x 15
This is a low drop rate recipe off of Doomforge Engineers in Forge Camp Anger in Blade's Edge Mountains.

360 - 375
Hyper-Vision Goggles (4 x Heavy Knothide Leather, 2 x Khorium Bar, 2 x Nightseye, 2 x Large Prismatic Shard) x 15
This is a low drop rate recipe off of Mo'arg Weaponsmiths in Legion Hold in Shadowmoon Valley.

360 - 375
Adamantite Rifles (2 x Thorium Tubes, 2 Adamantite Frame, 4 x Handful of Fel Iron Bolts) x 25 ish
I need to confirm when this goes green. I think it's @ 370, which means the last 5 points could take a while using these.
If you made it to 375, you have my utmost respect for levelling the hardest profession in WoW.

Approximate Required Materials

255 x Fel Iron Bars
10 x Felsteel Bars (add about another 60 bars if you go with Felsteel Stabilizers from 360-375 and minus the mats for Khorium Scopes)
35 x Mote of Fire
35 x Mote of Earth
60 x Khorium Bars
45 x Hardened Adamantite Bars
30 x Dawnstones
25 x Netherweave Cloth
180 x Thorium Bars