Hi!
That is a lovely idea for an enclosure, but it may not be suitable for piggies.
You can refer here for the cage size guide:
Cage Size Guide
Guinea pigs are ground roaming herd animals, so they require more horizontal space (side to side) than vertical space (up and down). The bare minimum that you need to have for your two piggies is the following:
1-2 guinea pigs: 2x4 ft (120x60 cm) or 8 ft square = 2x3 C&C grid cage; if you can, please consider a 2x4 grid cage instead as it is the
minimum recommendation
3 guinea pigs: 2x5 ft (150x60 cm) or 10 ft square = 2x4 C&C grid cage;
strongly recommended for 2 guinea pigs
4 guinea pigs 2x6 ft (180x60 cm) or 12 ft square = 2x5 C&C grid cage,
recommended for 2 boars or 3 sows or 1 neutered boar/2 sows
The mesh seems very low, which makes me concerned for the safety of your piggies. My three can easily jump about six inches when popcorning (excitedly jumping).
This guide:
Getting Started - New Owners' Most Helpful Guides
will lead you to important information about diet, housing, etc.
I do not see any hay in their enclosure, which is imperative for piggies to have 24/7. Nuggets/pellets should be fed sparingly as they are the "junk food" of the piggie world.
I hope that this helped!
Let us know if you have any more questions!