Well,if you are in the market for a DIY tank, then you can give Eleaf Lemo 2 Tank a shot,see here : http://www.vaporizersdistributor.com/eleaf-lemo-2-rta-rebuildable-tank-atomizer-p-87.html .

The Lemo 2 was innovative tank from Eleaf technology , the inheritance of RBA head can maximizes the fun of DIY experience and could bring cloud vapor production for you.Different to other brands Atomizer,the Lemo 2 tank with a unique design of a side fill hole and used the high heat and corrosion resistance PEEK material as its insulating piece. and following are mor details about this product.

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Features

with new innovative design of a side e-liquid fill hole
RBA head with PEEK insulator
3.8ml Liquid Capacity
enlarged air-inlet hole to creat huger vapor,while the device will not be too hot
Organic Cotton Wick
Temperature Control Nickle 200 Heating Wire
Larger Diameter of Mouthpiece

This is a amazing tank ,came from famous Eleaf team,which once developed Eleaf iStick 50w,30w,20w and with a good reputation. I belive , this tank will meet your requirment for DIY.