Wilko,
Well done on the great bargain for a hard case and showing real ingenuity in the quest for a better case to protect your camera gear! I am sure that for 95+% of likely conditions (and maybe 100% for many of us), that case will be completely effective in preventing any damage to your Hasselblad cameras and lenses.
I will only offer this additional bit of personal perspective re hard cases. When I received my Hasselblad 503CWD-II kit (with the 503CW body, CWD16-II digital back and 40mm CFE IF lens), which was far and away the most expensive camera I have ever purchased, I of course wanted the very best protection for it. I also knew I wanted a case that would accomodate the camera with the digital back attached, a PME45 finder attached and the 40mm CFE IF lens attached, so I could quickly pull the camera out of the case, put it on my tripod and be ready to shoot.
For me, the Pelican 1510 roller case with custom cut foam was the right choice and perfect solution. Many other cases would not allow me to have the finder attached and still have the same degree of protection (ie foam padding custom fitted to the camera/back/finder/lens. I am fairly confident that my 503CWD will never be damaged in transport, as long as it is safely contained in this Pelican case.
One other thing I like about the Pelican cases....you can take the same case and have it fitted with custom cut foam padding, padded dividers or put a soft case inside it (like the 1550 soft/hard case combination), so if I choose to switch to a padded divider system for my 1510 roller case or 1550 case in the future, all I have to do is buy the padded dividers, not a whole new case.
Gary