Sorry but I have to butt in on this one.
Good on you if you have the free time and skills to do this. I would do the same.
I am sure your cage will be a good one Jeff.
To make a decent cage you are talking at least 4 hrs ..probably 6 in reality of skilled labour at £30 to £35 per hour. Say 4 thats £120.00 Material and fixings £60. Finishing.. I.E. galvanising £50 ish (Thats cheap because most galvanising companies have a minimum charge of around £70.00 for a one off) Transport to and from galvanising as well. That makes £230.00 before VAT which brings it up to around £270.00 before any profit. The other big problem with cages is delivery cost. E.G. around £50 for a 500/650 because of the volume they take up.
Manufacturers have a lot of overheads to pay which DIYers don't. Rent/mortgage, rates, insurances, heating/lighting and equipment depreciation are just a few examples. It's a totally different ball game to someone who has the tools and skills to do it themselves.
I have looked at tank kits and don't like the idea of bolt together tank frames. In fact I saw one at Windex and was horrified by it
For the above reasons I don't offer a tank frame sales service. A 650 for example would have to be somewhere around £400.00 delivered and the supplier would be at the mercy of the couriers not to damage it (Big risk) and have you ever tried to package a 650 frame? It takes AGES.
My advice for DIYers is to get a decent local fabrication shop to make one to your design and have it finished by galvanising or made in stainless.
Andrew