My 2 cents if you don't mind.
I would take the time to actually build an upper and lower base cabinet out of less expensive materials that will be great for a garage. After building one set, you will have a better understanding of what it takes to make them and then you can decide if it is something you want to take on. It will also let you see if the tools you have are going to help you achieve the final results you want. It doesn't do any good to save $4000 in material/labor if you turn around and spend it on tools. This will also let you make mistakes and learn from them without throwing away a lot of money.
One of the options as far as tools is what I have seen from time to time on Craigslist. People re-doing a kitchen will buy good quality tools that maintain their value and use it for the kitchen cabinet work and then turn around and sell them on Craigslist. (I saw where someone was selling a number of Festool tools and vacuum, that had all been bought and used on a single house renovation and then sold.)
Take the time to layout and design all the cabinets and create a material cut list and lay them out on graph paper to maximize the yield of the plywood sheets. Anything that has a common dimension, cut them all at one time, so they are all dead on consistent. Label each piece as you go and check it off cut list as being complete. If you are doing panel doors, mill all of the stiles and rails at one time to the finished width/thickness, leaving them long for trimming up at assembly time.
Think of the process as an assembly line, do common components as a group, don't do individual cabinets one at a time from start to finish. Pre-drill all holes that you can.
You also don't have to assembly them until you are ready to install them. So you can take months to carefully cut all the pieces and stack the components un-assembled, taking up a faction of the space as fully assembled cabinets.
As you get all of the components done for a specific cabinet section, use stretch wrap to bundle them together. The hardware for each cabinet can be bundled with the pack as well, so nothing gets misplaced.
http://www.homedepot.com/p/Pratt-Retail-Specialties-5-in-x-1000-ft-Stretch-Wrap-5005001/202029371
The idea is to make them like the pre-manufactured cabinet kits that you can buy at the Borgs and just assemble. You are just breaking down the process into manageable steps: Design the cabinets, Create cut list, buy material, Mill material, organize material into groups, then assemble and install.
If you have multiple walls with cabinets and you can split it into doing one side then doing another side, so you will only need to assembly the cabinets for one side at a time.
Rob