I can draw a free hand sketch with enough details so it could look like yours (lol) with in 36 hours. (Honestly speaking, only use 36 hours instead of 1 day because am a student of bachelors pursuing mechanical engineering. So just to ease my self for some hectic days when i have to stay in university for 20 hours) I usually use pencil or pen for that. The pencil sketch can be revised repeatedly. Waiting and Hoping for a wonderful experience working with you guys,