Why there isn't a public proven homozygous spider 8 years into the project is a mystery. Possibilities I can think of include:
1. Just not enough interest in producing and proving one. When a stunning super spider wasn't produced quickly and so many nice spider combos where I suppose it's natural that not many (any?) spider X spider crosses are done any more. I just got my first pair of spiders this year (I decided to buy the female from myself for what I'd have to mark her down to sell) but was just thinking about if I'd breed her to the male to try to get a possibly disappointing answer or to a pastel and go for known stunning bees. I've got a year at least to decide but it will be hard to breed her to the male spider.
2a. The 25% chance homozygous spiders from spider X spider don't hatch. If homozygous spider is a lethal genotype then hard to say if it could happen early enough to even prevent shelling so as not to produce a noticeable 25% bad eggs ratio (which would actually be pretty hard to notice in a small number of ball python clutches anyway).
2b. The 25% chance homozygous spiders from spider X spider are not breedable and/or in some way not publicly presentable. In this scenario, maybe they look just like normal spiders but are infertile so can't be proven. Alternatively, maybe they are a train wreak chalked up to a birth defect and not talked about or perhaps they even breed but again aren't shown for some reason of appearance or behavior.
I'm sure there are other valid theories (a conspiracy to prevent homozygous spiders from being produced and flooding the market quicker) but the odds seem lower and lower down the list. Maybe we'll have an answer by the 2009 season and the 10th anniversary of the cb spider.