I think it would be a viable idea to use those charts. Often times these products are already set up for the most ergonomic position for the majority of people. Adjustments can be made to these products after they are purchased, such as adjustable legs for workbenches. Measuring your employees may be extreme/uncomfortable. There is also the chance that those workers you measured leave the company.
The anthropometric databases of the US military are quite thorough in their measurements however, one confounding aspect behind the measurements is that the population of army soldiers are taller and more physically fit than the average warehouse worker. More specific databases may be available but at the cost of a reduced sampling size which may negatively impact your designs.