Todd-
There have been 4 half dwarf clutched produced. Only one was from a Half Dwarf to another Half Dwarf. The latter clutch produced visible greens and albino Half Dwarves. The other 3 were from a Dwarf male to a normal sized female that produced hets or double hets. Currently, I have 10 Half Dwarves from 3 different clutches that have been produced. The oldest are the ones that I got from Randy and Michelle - they are 2 years old now and are about 6'-7' long...but significantly smaller in girth than a traditional burm - and I feed a couple of them more than I should because I want to see if these things really will get big. After heavy feeding - I am convinced that they'll never reach anywhere near the sizes of full sized burms and like Randy or Michelle says - probably max out about 8'...maybe 9'. They are still eating large rats and should be able to stay on jumbo rats for their whole lives.
Right now, I have 21 adult normal sized burms and 10 Half Dwarves...my goal (over time) is to convert my entire collection into Half Dwarves. They are smaller, easier to manage, seem to be more active and with the size difference and more activity, they stay healthier because they are more mobile, can stretch out and move more air through their lungs than the larger ones that we keep in captivity.
I have bred a dwarf male to an 18 month old full sized female and expect eggs at the end of the month. But...the Half Dwarf X Half Dwarf breeding (only 1) happened when both naimals were 2 1/2 years. I tried this year to get my 18 month old half dwrves to produce - lots of activity and they locked up several times but no ovaulations and consequently, no eggs. This year, there should be some clutches of Half Dwarves available and next year, there should be more visible Half Dwarves...green, albino and granite.
I think that Half Dwarves are awesome and are a great alternative to someone who has a passion for burms and wants to be able to keep more of them but has been limited by space, or for someone that just wants a more manageable burm in the long run.
Good luck with all your projects-
Tom