I have a similar setup - albeit a Fridgemaster MCF194.
With the tall kegs and a collar I can fit 3 kegs on the floor and one on the compressor hump. I can fit a 5th keg in there, but it only sits an inch on the compressor hump and the rest hangs over. Plus the tap shanks get in the way of it. I tend to only need a maximum of 4 kegs so it's not a problem, but when I do need that 5th tap running I found a 10 litre keg (like this
Stainless Steel 10 Litre Keg) fits in the floor space.
Two suggestions:
1. I put secondaries outside of the keezer. If they were inside then I'd struggle to get anything in or out.
2. The recirculation fan is mounted on magnets so I can take it off/replace it instantly when I need access.