Migration roadmap, from J!1.5 to J!2.5

Yes, what a nightmare

I guess there might be a solution to the clashing category ID problem along the lines of adding a large number, like 10 000, to all the category IDs, and doing the same for references in menus and within articles.
I'm sure there's probably good reasons why this wouldn't work

I must admit, I never even thought about Secions. I never used them in J1.5 (I just used a CCK extension if I had complex category structure!)

I was wondering if there had been any more developments on the upgrade path from J1.5 to J2.5, or if any changes are likely in future?

I gave up.
I tried to upgrade quintadolago.com/
I have 35 templates 45 types of content 85000 generated images, 3 languages, 90 fields, 2 gigas disc space.

The backup went up to 30g and PHP Timeout everytime.

I won't be able to upgrade this site.
It has to be manually.