I can recommend First Tunnels we have got one of their commercial tunnels, built it up ourselves (with a little help from a hired digger and OH always wanted to be a Bob the Builder...) but ours has been up for 3.5 years now and no damage at all yet. (Fingers crossed!)
However, even though the Polythene is dug into the ground and also some small hole wire mesh dug in too at the sides we have a vole problem, they just dig deeper... So I have to pre-germinate everything (which I do anyway), but am now in the process of mesh lining all my raised beds in it... just something to look out for! I planted autumn onions to try... but most of them are eaten now.
Also I am not sure a mesh for ventilation is such a good idea - you want bees/bumble bees butterflies etc etc in your tunnel to pollinate all your toms, beans, aubergines etc etc.... not possible if they can't get in!