The Aiox bed is the largest single part of the machine and Steve, Sarah and I have carried a few upstairs to there final resting place. A site visit is not always ease, so Sarah or Steve will talk you through what is required in reference to access / dimensions.
From not having a CMC to owning any size of machine, will make a massive difference to how you operate and the new work you can consider. So unless you are absolutely certain you need the larger bed size I would save a wee bit of money and room in the workshop and have the smaller bed size.
Vacuum is a great addition, but again, price and the type of work you do must be considered.Again with regard to the pen, only you will know if it will work for you.
One thing which is an important choice, which I am not sure you mentioned in your post is the head type. Have you thought about or discussed with Sarah the hybrid or twin head. In case you do not know the difference, the hybrid is a unique bit of engineering with a single blade that switches between bevel and straight cut. This system has been around for years and features on the F1 hybrid machines. The twin head is exactly as described, two heads, one straight and one bevel cut.
A number of lease companies can be contacted and as long as they understand what the machine does, the industry it is generally used in and how Gunnar operate in terms of payment terms, you will get quotes.
I run a Gunnar 601 and my choice if I upgraded to Aiox would be - standard bed size, twin head, pen but no vacuum. If I could afford a wee more, then the larger bed first and finally vacuum.
If you are serious about going forward in the industry then get one bought. To offset the cost of the machine you need to consider the benefits. The machine is like having another employee. Customers visiting you will have a new appreciation for your business, seeing you as more professional and credible than the competition who perhaps don't have a CMC. It will easily start earning you more money, because when customers see examples of what it can do, they will buy into the idea. As an example, normal rectangular mount or rectangular mount with design modified corners could be charged out at 50p per corner extra. Straight away, with not much time difference between cutting the standard or the fancy corner mount, you make £2 or whatever you want to charge.
There are loads of Gunnar's out there and loads of support to go with it too.
