Not sure iphoto will meet your needs. There is a Shareware program, GraphicConverter, that will work. However, I found it to have a steep learning curve. The program can be downloaded from Apple's website or lemkesoftDOT.com.
For info on Gimp> wwwDOT.gimp.org/downloads/
Remove DOT from l
Have you asked students using a Mac what graphics program they use?
Larry
Not sure if this is what you are looking for.
In Mac SU select: sketchup>preferences and the window shown below will open. An application may then be selected from the Mac application folder. The Gimp app is the one I use and is not in the default application folder.
Larry
@rfritz said:
Here's a drawing of a tool cabinet that is on my to do list for this winter. My original drawing had only drawers and no cabinet but after thinking about it for a few days I modified the drawing by removing 4 drawers and adding a cabinet with shelves. I'll keep you posted on the finished project. Ron
Ron, have you considered, or planned what each drawer/shelf will likely be used for? I find small drawers not very useful - larger drawers with moveable dividers work better for me. Just my opinion, but what I need to store, dust free, always changes.
Larry
Your using SU7 
Don't save as a template, use "save as" and save directly to the template location shown in the screen capture you posted. Quit and restart SketchUp. Look under SketchUp> preferences> templates and you should see the file name, select that as default. Quit and restart SU. It worked for me. They changed things in SU7. 
Larry
Go to SketchUp> preferences>template. Is the file you saved the default setting? If not, is the file you saved on the list? Is so, select that as the default template, quit and restart SketchUp.
If you can't find the file you saved type the name in Mac spotlight and see if it is saved in the correction location. I had the same problem, as I remember, it was because the template was saved in the wrong location.
Hope this helps.
Larry
Gene,
Sturdy design. Some questions:
-The top is massive. Using 1 3/4" thick QS white oak, how would you build the top (joinery, glue-up, etc)?
-Is this a "knock down" design, or would it be assembled on site?
-Have you considered the top overhang? It is over a foot at the ends, that is a lot of weight. I understand the need for leg room when designing a dinning table.
-I think you would need rails between the legs to support the top adequately. The upper long rails, under the table, are about 17" from the sides.
Don't take my comments/questions as criticism, I have never built a table even close to this large. I'm a hobbyist woodworker, and I like looking at plans and asking the how and why of a design.
Doing "what if" design is a great way to learn both SketchUp and woodworking.
My attachment is a drawing I made from a plan in: Mission Furniture How to Make It, POPULAR MECHANICS COMPANY, 1912. The top is 46" x 34" and 1 1/8" thick. The side rails are not glued into the mortices. This allows for the table to be knocked down after removing the top and shelf keys.
Larry