Frame Materials

I have got a frame layout that works well, and that I should be able to produce without a workshop, Ill put some pictures up online tomorrow. 

My initial  plan was to construct a timber frame however after a trip to Bunnings aluminium angle seems like the material of choice its quite cheap and I have familiarity with it. I may still use some timber for the base of the machine then use aluminium for the load bearing parts.

Next stage is to check online for more angle suppliers that may have better geometries or cheaper prices than Bunnings then hit the CAD and finalise the design using aluminium angle so when I buy the matrial I will know exactly what size to cut each piece.