I'm going to slightly disagree here, there have been Freestyle's that have passed the IVA, therefore thinking laterally Blitz's must be able to as well. I'm fairly sure I have seen several on Fleecebay that have been IVA'd.
It's 5-6 years since I last put a buggy through & that was SVA rather than IVA, the rules have changed, but I think when we have discussed it in the past it all came down to the so called sharp edges. On SVA the cockpit/driver area was not tested much, I seem to remember the IVA was a little more specific.
There is also the cost, from £200 up to £500 for the test & from £35 to £90 for the re-test (you will need this unless you are very good)
In short, yes it can be done, can you do it? do you want to do it? can you afford to do it? only you can decide on that.
If you do decide then start a project thread, put up lots of pictures, if any of us see anything that we feel needs attention I'm sure we'll let you know. It would be good to see some new builds starting again, it's been a bit quiet on here.