You should chop one apart. They are really a mess. I am not saying it cannot be done but it would be a pain and about the worse design you could come up with from a flow standpoint. If you are looking for easy and cheap just make a log manifold. There is no reason for twin turbos with today's turbos. A good sized single will spin up really well.
For instance we are running a B/W S366 on a om606 diesel project I am working on and it is huge. With a 1.0A/R. And it still hits at around 3k RPM. If we drop the A/R down we could get it spooling at around 2500 rpm. You could use half the turbo to make 4-500 hp. And it would probably spool earlier on a gas engine as well.