I don't feel a murraya with its compound leaves works well as a mini and considering its rampant growth habits I think it would be an awesome task trying to keep a mini under control. Due to the quantity of trunks that appear fairly well disposed to a multi-trunk bonsai I would not be removing many. It is hard from a static photo but I would remove those trunks that were complicating or cluttering the design as well as removing thickness at the top of the tree.
Murraya's can be cut to buggery [and I wish ALL those along the dog walking footpaths of my suburb would be!!!] and after a licking-wounds period [all too brief] will shoot everywhere so cutting back hard is definitely the way to go. I do think as much height as artistically possible would make this a very imposing tree. Carving a Murraya doesn't sit well with me. I can see using the Dremel to make a stump or cut off branch more naturalistic but doing actual carving... Jamie get a juniper or a pine or an olive and go to town on a tree that is seen in nature with a lot of deadwood if you want to go to carving heaven. No matter how good carving is if it doesn't suit the tree you can ruin a good subject.
I would be removing unnecessary trunks but delete them from the design as the remaining trunks tell too good a story on their own for the viewer to be distracted by carved jins. Get cracking in the upper layers and remove thick trunks/branches to get your balance - that's where your main cutting will be. I'd be cutting branches flat across and waiting until nature started throwing out leaders and branchlets and then choosing those going in the right directions and reducing and tapering the stumps accordingly.
My god but I'm glad you are young to be able to manage this tree. But fantastic to see such high quality stock going to such a good home where it will get a great future.
Looking at my tarted up photo again I would be aiming between the yellow and the blue line for the top foliage limit. I think the yellow is a bit too high but that depends on development over the next couple of years. But its the base area where the editing has strengthened the visual lines of this tree and all those damn branches are going in the right direction. Wonderful. Murphy must have been looking the other way when this developed.
murraya.JPG
You do not have the required permissions to view the files attached to this post.