Builder upgrades

Dark elixir = de. Town hall = th

Builders should be upgraded. But builder hut buying will cost and be the same.
When u upgrade a building it will ask u what lvl builder to use the higher lvl the faster the upgrade will be.
At Town hall 7 builders can be upgraded to lvl 2(thats the max at town hall 7). They go 3% faster.
At town hall 11( when it comes out). You use 2,000 gems and 200,000 dark elixir To get a level 10 builder which goes super fast. The lvl 3 builder goes 6% faster and lvl 4 goes 9% lvl 5 12% faster. It upgrade 3% everytime you upgrade

Prices:
Lvl2:1000 Dark elixir and 300 gems at Town Hall 7 and 3% faster and upgrades
Lvl3:10,000Dark elixir and 400 gems Town Hall 8 and 6% faster and upgrades
Lvl4:20,000Dark elixir(de) and 500 gems Town Hall 8 and 9% faster upgrades
Lvl5:30,000de and 600 gems at Town Hall 9 and 12% faster upgrades
Lvl6:40,000de and 700 gems at Town Hall 9 and 15% faster upgrades
Lvl7:100,000de and 800 gems at Town Hall 10 and 18% faster upgrades
Lvl8:120,000de and 900 gems at Town Hall 10 and 21% faster upgrades
Lvl9:160,000de and 1,000 gems at Town Hall 11 and 24% faster upgrades
Lvl10:200,000 de and 2,500 gems at Town Hall 11 and 27% faster upgrades
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The max for lvl builder for each town hall:
th7: lvl 2
th8:lvl 4
th9: lvl 6
th10: lvl8
th11: lvl10
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but the effects ONLY work on upgrades, not buying from shop

And they should have a dark elixir storage lvl 7. So it balances out the game.