[lakeroadster]

Here's what mine look liked after I removed the wood. Short Step 67-72 style. I was told it is missing a tall cross sill.

Evidentally though that sill wouldn't bolt to the frame... 'cause just like yours there are no holes in the frame for that cross sill? Seems strange to me. It's all good. I put a custom pressure treated plywood floor in mine... put the cross sills back just like I found them.