Yes they did, just search their forums... Support, Knowledgebase, Extras. I'm not going to post the link as its not hard to find, I've tested it and it's an excellent bot, the best thing about it is that you can't get banned as it's RiD!
I know oembots.com has a construction bot, but I don't know anything about it. All the bots I've tried from there have been good, so I assume that one is good too.
RiD has undetectable bots... i've been using them for ages. YES they do have a construction bot, it just hasn't be added to the myrobots section yet as the site is being edited.
i tried their construction bot and couldn't get it to work even with the guide, but yes they have one, and more power to you if you can get it to work.
As everyone else has said, Robotz In Disguise has the best Construction bot to date. Even though it doesn't do everything (only does Oak Larders atm, making 140k exp an hour) it is undetectable and will get you 99 in about 90 hours, which is about 11 days following Guidelines.
It is a little difficult to set it up correctly, but if you follow the instructions to the letter, it will work wonderfully. (Be sure to set Java Priorities)
I know oembots.com has a construction bot, but I don't know anything about it. All the bots I've tried from there have been good, so I assume that one is good too.