None of the clones require a furniture van.
But none have the enclosed base woodwork of a C3 either. However, lots of them look more or less exactly like the B3 with the spindle legs, and they all have the same (and more) sounds and facilities as the vintage B3/C3/A100 console organs.
I can't comment on 'affordable' because that's entirely subjective...
Many of the clones will cost a lot more than a real B3/C3/A100... but you don't have the weight or unreliability.
The range is from about £20k down to about £1k -- and the core sound is actually pretty consistently good across the range. The differences are mostly in the keyboard action and construction, the woodwork, the number of physical drawbars and so forth...
Knowing your preference for things that look like the originals, the most likely options would be the Hammond B3 mk2 -- available in traditional wooden chassis for about £20k:
....or a portable model for £14k:
These both have digital Leslie simulators, but if you want the proper mechanical whirling box to partner them you'll need to stump up another £3.5k
A slightly more affordable alternative is the the newer XK5 'classic' System which still looks like a regular B3 but costs £13.5k and that comes with the full size mechanical Leslie box.
However, if you don't need or want the big mechanical Leslie or the pedals the XK5 with a lower keyboard would set you back about £4.8k, or just the single keyboard XK5 itself would be £3.3k.
All of those models have superb keyboard actions that are virtually indistinguishable from a 1960s original, plus full sets of drawbars and excellent digital Leslie emulations.
If you're willing to compromise slightly on the keyboard feel and the drawbar counts, there are several less costly Hammond options, such as the two-manual SKX (£2.3k),
...or single manual XK1-c (£1.1k),
I have both, and they're very good!. There are also three SK1 variants that add other keyboard sounds to the Hammond and have 61, 73, or 88 note keyboards.
And then there are all the two-manual /drawbar clones from other manufacturers like the Viscount Legend Live (£1.6k)
Crumar Mojo (£1.5k),
....and there are still a few Nord C2Ds around for about £2.3k.
And then lots of Hammond-esque emulations available on all manner of electronic keyboards....
Plenty of choice depending on requirements...