Hey welcome to the forum.
There is a lot of good information around the forums here that focus on different things and a lot of your questions are answered in various topics.
Guinea pigs should never be housed outside. The extreme temperatures both hot and cold can kill your guinea pig, not mention predators have been known to swoop in and kill them as well. They should be in a well ventilated and climate controlled environment.
Males sometimes have issues living together in one cage, but a lot of time the problems are caused because the cage is not large enough. I have had to make a C&C cage in the past with a grid divider for 2 males I have owned before so they could see each other, but not hurt themselves. If one of your guinea pigs is seriously injured be sure you are taking him to the vet ASAP.
I am really glad that you are making a c&c cage! Your pigs will be so much happier. I would say that if you are going to have 2 males with a divider between them, each side should be at least 2 grids wide and 3 grids long. The more, the better! You could definitely make a two story cage and you can find ideas on different styles of cages in the photo galleries!
You should be able to find materials near you instead of having to pay so much money to get a cage shipped to you, but I am not familiar with stores in the UK, but I am sure there are many here that might be able to point you in the right direction.
I hope that helped you a bit. Remember that 4 pigs is a lot of responsibility and you want what is best for them so money does need to be spent to get them the things they need to be happy.
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pinky Your cage is very nice

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