The custom gonk that rustyj sculpted (resin casts recently shown in customs section) is more accurate than the Hot Toys version. I'm still curious to see how the HT one turns out but the rustyj one just looks noticeably better, and I believe he's offering it painted by Pete (part of the custom landspeeder team.)
Yeah the custom has a more accurate design, but honestly I'm still feeling more tempted by the HT version which you can put in walking poses and convey a bit more personality with.