Welding sill to bulkhead/toeboard

Could anyone tell me where the welds are for the front of the sill to the bottom of the toeboard, please? I know the pattern for the upper, top surface, but I’m not entirely sure how the underside was attached. Is there a seam weld, or interrupted seam weld, along the sill-to-A post-frame joint? Or was this spot welded during assembly, meaning I need to plug weld it? Was the inner skin, cut at an angle, welded to the angled front channel of the frame?
Thanks all