hello guys hope you are all well, i have a kitchen in a 1930s house that has most of it concrete however about 2sqm of it has floorboards. Im planning on laying lino on the kitchen floor, but the gaps between the boards and also between the concrete and timber are quite pronounced. I can lay OSB to bring levels, but the concrete has a little curve, and am pretty sure will show on the lino. What would be the best method to cover both floors and eliminate those gaps? Was thinking 5.5mm ply, self levelling compound, etc, please let me know your thoughts and if you have dealt with anything like this, thanks in advance!!