Well my last visit to the local machine shop was disappointing. They kept moving my custom tie rods back because I guess they weren't as important as the hot rod guys stuff. I was thinking 300-400$
I hate to be the bearer of bad news, but I just looked at the Arachnid. From what detail they let you see in the ad video and select photo's, pretty much no one is going to build one for you for $400.00.
Here's my question for you all who have these psychotropic prices in your minds for what things cost; in this case, an Arachnid. Here's the question; What makes you think that someone is going to
Custom Fabricate anything for you for just /or
Less Than the cost for the raw materials?
Here's a good example; Spydercarts list a very simple kit for sale that's built by Azuza; basic cart, comparable to the Black Widow. List price for the kit $669.00. That's for a kit that they've been building for years where they've spread the cost of research/design and the tooling over hundreds, if not thousands of them. So what makes you think someone is supposed to build something that's at least 4x more work for 1/3 to 1/2 the price of that really simple kit?
I've been in the same position as your machine shop because I've spent my career as a machinist. A lot of shop's will occasionally take on small charity cases, but they are at the back of the line.
Business's Are In Business To Make Money. They do not work for free. If you want something like a cool cart, the most effective way to lower the cost is to do it yourself; but you have to be ready to do the whole thing yourself.
qtband, in a perfect world your idea would work; problem is, most shops won't touch a project that someone else started cutting the matl. There's too many people who don't/can't accurately read a tape measure, and most shops refuse to deal with the mess that results.
Again, unless you know/ are related to someone who will do the work for next to nothing for you,
It Is Going To Cost You. If you see it premade for "xxxx" amount, buy it. As a loose rule, having it custom made is probably going to start at 3~5 times that price. I'm sorry if that's not what you want to hear, but that's the way it is. The sooner you learn and understand that basic concept, the less disappointment you are going to have to suffer thru.
Now, if you don't want to/ can't fabricate your own chassis, you do still have options;
1] Find a cart/ chassis used that would be adaptable to your needs/wants.
2] Find a kit/ project that someone else has gotten bored with and/or abandoned.
If you find it for sale on EBay, Craigslist, et al, that's a totally different story than having it custom built for you. It's whatever the market will bear. But that other old rule applies as well; Let The Buyer Beware.
Sorry about the rant; it's just that it needed to be said (and I know I'm going to have to repeat it again in the future).