Upgradable builder huts

i think it would be good to have builder huts upgradable because 5 builders isnt enough to do what we need to upgrade now that th11 has came along. here are some ideas on the levels and cost as the builder huts are upgraded:
lvl2 builder hut:
building speed increase: 10%
extra builder: 1
hitpoints: 500
cost to upgrade: 100000 gold or 100000 elixir
lvl3 builder:
building speed increase 15%
extra builder 2
hitpoints: 750
cost to upgrade: 200000 gold or 200000 elixir

that will be all that is needed for the builder hut because we already have 5 of them
this is what i think we should have in clash of clans to make upgrading easier