Simple Machine (help and advice needed)

[Gregor]

Hi
I have been away working for the last year so haven't been able to complete this project but i am now hopefully back for the next 12 months. To recap My goal is to make a simple strong build which will be able to cut hard woods and aluminium at a reasonable speeds, I only have room in my workshop for a machine off 900mmx800mm,I have done the design using 100mmx60mmx4mm box and 60mmx60mmx4mm box .I have change the design from my last attempts and after reading some more logs would like to try and make it using belts and pulleys if possible.The Z axis i hope to make out off aluminium. Here are a few pics
Cheers