Looking to build a Kitchen island (see drawing) that's 2200mm in length by 850mm in width. All made from tulipwood, the rails are 300mm in width and 25mm in thickness and will be mortise and tenoned into 95mm x 95mm legs 870mm length. There are 4 drawers on either side which will be made from birch plywood. Internally there will be 25mm plywood tie rails along with a 25mm plywood spine that will run through the middle between the drawers to add extra strength. Worktop is quartz.
My question is, structurally is the length of the table plus the weight of the drawers with its contents, strong enough for just four legs, or am I going to need to add a couple more to support the middle?
Any advice would be greatly appreciated.