Separating|Combining mod (Strata)

According to the current GS price (5kk averagely),

separating will cost u 23 GS*5kk=115kk

combining will cost u   8 GS*5kk=40kk

I.

II.

III.

Enhancement ELN +7

Since the economics in Castilla is in a bad state, mostly it is cheaper to craft things yourself.
I've tried to count the cost of enhancing ELN from +0 to +7
I dun use Dazzling Ore for saving the enhancement.
So, the ingredients are:
1. Impervium Vet +5
2. Impervium Vet +6
3. Enhancement Booster

Math:
1. Impervium Vet +5===> 3pcs*200,000 feso= 600,000 feso
2. Impervium Vet +6===> 6pcs*300,000 feso= 1,800,000 feso
3. Enhancement Booster===>84 pcs*6,000 feso= 504, 000 feso

TOTAL: 2,904,000 feso

SO, it's approximately 30 Growth Stones* 4,940,000 vis=148,200,000 vis

Latest price in mm was 300,000,000 vis for ELN leather +7 (+3 DR)