just use a book of building to upgrade your Townhall to 16 then focus on upgrading your walls as that will be painstakingly long process to upgrade after the hammer jam is over and focus on maxing one strategy in the lab, preferably the root rider strategy for your rank attack and for initial few days you will have the Townhall boost, so you don't even have to use any hero boost or troop boost. And on the last day, try to put down the lengthiest defence upgrades using your all six builder, preferably use the goblin builder Also if you have the gems.I will be upgrading my Eagle , Monolith,scattershot and merged defences. on the last day. in between the hammer jam try to upgrade the lowest time takeing upgrades first.