For advice on growing lots of types of veg we have a library of info here courtesy of John
http://www.allotment-garden.org/vegetable/I don't know if this will help. but I just have a notebook and I use a separate page for each type of seed, so I have a page for beans and peas, 1 for all greens and cabbage, 1 for pumpkins, squashes and courgettes and so on. I keep a page for odds and sods that don't fit into the other sections and lump them together.
For a lot of seeds, the sowing times are around the same e.g. your tomatoes, your summer beans. The rest you can note the sow times per type.
For space planning, start with the ones that are there a while and work down. It may be easier to allocate small blocks out in the tunnel, rather than rows, so you make the most of the space.
You could also have some standby seedlings on the go for space filling. Beetroot can be sown over a long season, so you could fit a group of say 6 modules (sow 3/4 seeds per module and plant out as a clump) into the gaps.
Don't use the whole packet of seed and just grow a bit of each. That way you can try lots of things. see what you like and what grows for you. Also take account of the long season croppers. For big producers like the courgettes, 2 plants should be plenty as they just keep coming. Obviously 1 cabbage seedling is 1 cabbage, so what you sow is what you get.
Don't be overwhelmed by it all. The worst that will happen is that you have a few too many seedlings and have to chuck them in the compost
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