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Yeah, I'm not sure about the exact way I'll be doing it, as there are so many options...
But I do know that I better get started in the next few months.

If you don't mind me saying .... Quit thinking and just go throw up something, anything. Getting started is what is important ... if you wait for the "time, perfect place, perfect materials, MONEY !!! it will never happen ... watch vids on a scale that you can do NOW to get started ... just saying ... "Square Foot Gardening" is a great concept for space utilization, leading to a more successful "greenhouse " or garden...
Good Growing & Eating !, Good luck !