Fixing wooden frame to garage entrance - DPC considerations

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I have a double garage sized outbuilding at the back of my property, no longer accessible by a vehicle and have partitioned it down the middle so one side can be used for storage but the other side can be 'kitted out' for office/ gym use. I've had the floor dug out and levelled with 100mm kingspan boards, DPC and 4-5 inches of concrete laid so far. I'm now at the point where I need to cover the gaping entrance void. The concrete floor is now level with the outside ground and I am considering a full wooden frame for windows and a door to let in as much light as possible.
I'm wary of DPC but also don't want to raise the internal floor if it can be helped as the loss ofd height towards the back will give me a sore head!

Can I get away with a 100mm lintel across to front, cemented, bolted and sealed to the entrance floor on which I can lay DPC on top ready to take a wooden frame? This would then leave me with a step up/down on entrance and exit but nothing too drastic.

I was thinking the following would work, laid with 100mm as the height?

Supreme Prestressed Textured Concrete Lintel 100mm x 140mm x 3600mm R15

Any advice on how best to secure it would be much appreciated.
 
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