Silyavaski. Thanks for taking the time to modify your model with the dimensions I am looking for. I have to say your frame design does look so much more solid than the one I designed. The one one constraint I have is that I need to move the machine in the house so I cant have it all welded. I can see though that if I made the cross members you have proposed as bolted rather than welded, this might work. I'll have another look at the Z height and see what that means for the rail height. Thanks again. Tony.