I got this plan from the Weldingtipsandtricks.com web site and decided to try it out. It took me about 2 hours to make. it was deceptively harder than i thought to get the rear supporting legs the right length to make the table level and took some fancy grinding to make it bolt up to the existing saw holes. I suggest you have all the parts ready to go before you start. I also suggest that you only do this project if you have a porta band sitting around unused and really need a small band saw. If you have the room and money you would be better off getting a used table top or stand alone band saw off Craig's list. for about the same price you would pay to buy the saw and do this project. the last thing I want to do is be the guy who tells you how great a project this is when it was really just ok.... in the end I didn't really need a portable saw. and I have the space for a bigger saw.
The two side legs are 14 gauge 1" x 1" 12" long. The spreaders are 9" wide they also serve as the support for the flat spot on the bottom of the blade guard. I self adhesive felt pad under the blade guard and 4 rubber feet to absorb vibration. I got away with just putting one washer in under one of the rubber feet to level the stand. you may wish to use adjustable feet but they cost more. the rear supports are just 11 gauge by 1" hot rolled. put it in a vice and hammer a little 90 ear. you have to drill the hole close to the edge so you can get it in the slot to catch the saws housing bolt hole. you will have to round off the corner too.
I got this aluminum plate from the scrap pile at my steel store. It was 1/4 inch and should be long enough to catch the rear bold hole from from the original guide plate. it should not be thinner than 1/4 inch as you have to counter sink 3 #10/24 bolts to hold it to the blade guard. you won't be able to reuse the existing bolts unless you go really thick.(they are Pan Head) I suggest taping the old bolts to the old base plate and putting it somewhere safe in case you ever need to go portable again....
I used a Sawzall to make the cut but I suppose you could use your band saw.
good luck and feel free to ask any questions.
Keep in mind you will have to rewire the switch with a toggle or something to bypass the variable speed switch on the saw. Or just do what I do, make your kid pull the trigger for you, They think they are being a big help..