thanks for the report

really glad you played it as you did as it really highlights the weaknesses the list has IMO
I've always taken terminators in my games, they're pretty much a given as you need them to deal with threats like artillery (especially manticores and void spinners) as well as to prevent your opponent pushing forwards and screening their table half with scouts as Steve54 notably did against me a few months back!
did you play with the increased bunker save (ie unit has RA rather than the 3+ cover save)?
honestly I'm not surprised, making marines hang around and get shot at is just not the best way to use them! as I've said before, I've tended to take a couple of tarantula and hyperios formations and then just push forwards with the rest which has been quite effective as IF have a bit more firepower than their codex equivalents thanks to thunderfire batteries and fellblades
if playing the EpicUK transport rules I think the fortifications would be handy, you can choose before deployment whether to bring rhinos or fortifications, but NetEA means they're fixed as part of the list
as to deployment I'd say you can deploy the 'plus transport' fortifications as normal ones, you then don't
have to put the formation in them (although you probably should!)
Intrigued by the idea of deploying minefields in the opposing half, however the list already has so many special rules and concessions... I'd rather try to figure something out.... I do however like the idea of hidden minefields
maybe you could place them as a marker which has a 10cm radius, you could then spend say 25 points for 1-2 dummy markers so your opponent is never sure where they are
alternatively how about for a certain cost, the IF can put a 15cm minefield around an objective in their half?
any other ideas?