It's really difficult to put a value on something like this without seeing more photos and hearing it run. People are paying crazy prices for these. It's up to $22,050 now. I wouldn't be surprised if it sells for $28k.
IMO, there's not enough info in the listing to assess an accurate "worth" for it. It looks like someone stated up a partial restoration or at least a decent paint job. The photos of the underside and frame don't show much of anything. It could have frame problems. (Mine did when I bought it.) That looks like the original H engine. They aren't known for being as reliable as the 2H and parts are almost unobtanium in North America. (Seriously, you even have to order the oil filters from overseas. SOR doesn't even sell them these days.) The auction doesn't state anything about the condition of the engine or trans.
There are red flags that show the "restoration" wasn't completed. The roof gasket not being installed is one indicator, and you can also see that the defroster duct was cut off and not repaired when they pulled the heater to paint the interior. I'm sure if I stared at it for longer there would be more. (Like what's the extra fuel inlet for? Aux tank?)
RHD shouldn't really be an issue in terms of value. Sure, LHD is more desirable for most people. But, IMO, LHD isn't worth the premium prices they command. Sometimes as much as 50% or 100% more than a RHD in the same condition. If you've ever spent any time driving a RHD Cruiser you'll quickly realize that LHD isn't worth the $10k or $20k extra. Sure, it's great for the sellers if people are willing to pay it.