Has the designer properly detailed the method of hanging the floor off the beam or is it just a vague 1:100 drawing and you have to guess?
Put the timber in the web (it should fill the web) and drill some 10mm holes along the centre axis every 1m. Fix with some m10 bolts and large washers.
Then fix some long legged hangers to go up the timber and over the beam
I don't know why he has specified m12 bolts, they are not doing much.
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