As I said earlier I am amazed at how much work can be accomplished with simple tools. It is actually possible to cut all of the metal in this entire project with a simple hack saw. Of course it is also possible to mow your yard with a pair of scissors. One way to look at the purchase of a new piece of equipment is taking into account what other jobs or projects it can be used for. So a Band Saw is not an absolute must but neither is a ratchet wrench. But they can make the work go much faster as well as efficiently. One source that I use for good reasonably priced tools is Northern Tool. Most of their tools are inexpensive (although not cheap as in "ain't no good.") Here is a nice little Band Saw that is a great addition to any garage workshop.

It will cut up to 4 1/2" diameter round stock, has a 3/4 horsepower motor, will cut horizontal and vertical cuts, and sells for around $225.00.

An alternative tool which can also work equally well for most metal cutting jobs is a chop saw. It is capable of cutting most strait cuts as well as angle cuts and in some ways it is easier to set up than a Band Saw. Since you would be cutting metal this is the time that it is worth paying a little more for the additional horse power. Here is a good choice for a chop saw.

This is a Milwaukee 14" Northern Tool model 6180-20. It has a cutting capacity of 5 3/8" Round stock or 5" Square stock. It sells for approx. $200.00.

You will also need a 14" abrasive cutting blade to cut metal. You can try using a wood cutting blade but it would kind of be like trying to use your wife's good sewing scissors to cut chicken wire. Here is a picture of the kind of blade you need. It is a Norton chop saw blade 14" Model 076607-89399-4.

Here is a cheap lawnmower.