Tis the time of year I start dragging these out of the barn and putting them together and thought I would grab a picture or three and share here. Ok this is more of a mini green house or cold frame, but it will grow cool season veggies year round in Zone 5 and 6 I use them for moving plants out of the starting rooms and big greenhouse to harden off Tomotoes, Peppers, Egg plants etc . I run 12 of these that are 10'w and either 16', 20' or 24' long. I have found that over 24' they lose their stability if you don't add additional bracing and it is more cost effective to just build another unit. A basic 8' x 12' that will serve a lot of folks needs is cheap to build around $60 in cattle panels, $20 in lumber, $10 in hardware and $40-$50 for the plastic or greenhouse film. So somewhere in the neighborhood of $140-$150. You can make them pretty or you can make them basic and not so pretty. Mine are for production so pretty ain't real high up on my list, Functional is. 8x12 will be around 6' at peak While my standard 10' wide are 5' at peak. For ends and the primary support I just use a 2x4 T and use fence staples to hold the panel onto the contact points with the T and use 3 bolts and nuts to connect the bottom of the T to the base board on the ends and then bolt a 45 degree 2x4 from base to the T to stabilize it. You can use fence staples or U bolts to attach the cattle panels to the sides of the base boards. I use u bolts because I take them apart at the end of may and store them in the barn until the following March. Once built it only takes about 20-30 minutes to put each one up again out of the barn. The first 4 I built 25 years ago are still in service today, although they do get a new skin every 8-10 years. Storing the greenhouse film triples the effective life span of it. I don't get fancy with the ends and just use cheap woven tarps. I don't care about looks just keeping frost out and warm in I start around 40,000 plants every spring for my own fields and to put into 4" pots to open the farmers market season up with. So there is a fairly constant rotation from starting chambers and the green house to the cold frame to the big potting shed to the big high tunnel and then out to the fields or to the markets. If just growing for myself and family 2-3 of these would be all I needed for fresh lettuce, greens and radishes all winter long and ample space to harden my cold sensitive plants like tomatoes and peppers. Just started putting the frames together yesterday and will post more pics here once I get the ends and skins on and again when the flats start rolling out of the green house and germination chambers.