Tank Build Program

I wanted to start plotting out a tank build that I want to start after I get married and get a new house (in the next year)
I was curious if anyone could direct me to some graphic software that I could use to draw it out. I have seen some really cool build logs but I am not very skilled with any graphic programs.

Thinking of doing a 240g = 60 x 36 x 25 Tall
 
I have seen several on Reef Central comment on using Google Sketch. The standard free version can get you going, but you might want to invest in the "premium" version if you are planning going all out.
 
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