Hatsan AT 44-10 tactical (bullpup conversion)

I have the Hatsan AT 44-10 tactical on .177. It's a good gun but it's a bit heavy for handheld shooting. I wanted to convert this into a sleek and light bullpup. No clue where to start. Are there any reputed bullpup stock builders whom I can reach out to? If you guys can put me in touch with someone who could customise one for me and ship it to me, I would be grateful. 

Thanks.