Does anyone with deep experience within welding have any pro tips on fixture design? Even willing to do some consulting? We are tackling this at the moment and

Does anyone with deep experience within welding have any pro tips on fixture design? Even willing to do some consulting? We are tackling this at the moment and getting some grossly conflicting inputs from manual welders, automated welding equipment suppliers, and other sources. Basically we want to produce precise and repeatable assemblies mainly out of 304 beam stock, but with a view toward validating precision before investing in automation we've become aware that fixture design will be critical, yet lack experience. Our initial prototype fixture already functions successfully with pneumatic work holding, but has numerous design flaws.