Rabbits and guinea pigs should not be kept in the same room or share an air space. Rabbits carry diseases harmlessly to them but those diseases can be fatal to guinea pigs.
If you want rabbits, then they need to be kept in an entirely separate area, well away from the piggies.
As a 30 year rabbit owner myself as well as having piggies , I work incredibly hard to make sure there is never any risk of cross contamination between the two species (no sharing of equipment, always dealing with piggies first and then washing hands etc).
Please also note that rabbits must kept in pairs so you cannot get just one.
They also cannot be together if they are not neutered, and given a spayed doe and neutered buck are the best pairing, you would need to keep the two rabbits separately but next to each other for months until they were both old enough to be neutered and safe to live together and then carry out a bonding (which is done differently to a piggy bonding so is a much slower process, sometimes taking weeks for them to bond).
A buck/buck pairing can work but are less likely to. You definitely don’t want to put two unneutered bucks together as soon as they become sexually mature, fights will occur. Even after neutering, two bucks may not accept each other.
A doe/doe pairing can work (I’ve had several doe pairs) if they are siblings or introduced at a very young age. Again though, once they hit sexual maturity issues can occur as they become hormonal and territorial but they aren’t old enough to be spayed until closer to 6 months (no earlier than 4 months of age) So if can be a tense few weeks.
You will find it hard to bond two unrelated, sexually mature but as yet unspayed does. Not only for bonding, its essential does are spayed to remove the risk of uterine cancer occurring.
The best and most stable pairing is a neutered buck/spayed doe.
Unlike with piggies, neutering and spaying rabbits does calm their behaviour, stops urine spraying, makes it easier to litter train them as well as being essential to stop pregnancy in a mixed sex pairing and cancer in a doe.
If you really want rabbits, it’s best to rescue an already bonded already spayed/neutered pair, particularly if this is your first time rabbit keeping.
Space is a major issue with keeping rabbits though - they need a huge area and a hutch alone is not enough. A 5ft hutch is not big enough for rabbits, and definitely not the breed of the rabbits you mention. A pair of rabbits require a minimum of 60 square feet - that is an enclosure of a minimum of 10ft x 6ft but given the rabbits you are considering are a large breed, the enclosure needs to be considerably bigger than that.
Bored rabbits are very destructive so giving them huge amounts of enrichment including digging pits is important to keep them happy.
Rabbits should never be locked into a hutch - having a 6ft hutch is fine as a bedroom space but the hutch door needs to be left open giving them 24/7 access into a secure enclosure measuring in excess of 60 square feet.