Looks like the KISS approach is completely being over looked here? there looks like a complete ton of needless work for what will amount to very little gain in a home built machine. Welding all that extra in will no doubt make what will not be perfect in straightness even worse. Deanos if you want to make precision NASA approved telmetry parts go for. If you want to build parts that any motoring manufacture would be pleased with don't bother. The sort of numbers we have been looking at will not make a bit of difference to you i truly believe that. By not adding all this extra rubbish you will be keeping down the weight and expense, you can always make the parts with the machine once it is running.
KISS KISS KISS KISS