Personally I would go much further than the other guys.
If you want to develop a REALLY top tree ( and this one could be) I would cut back all the branches right back to about a few (3) cm from the trunk.
All new branches should then be wired into possition in summer.
When they have set, defoliate the entire tree and remove the wire.
Cut back all wired growth to 20mm no more. This is what gives taper!!
Remove evrything else unless you want to use it.
Rather than just your standard first second back etc., create many more branches from the trunk.
Repeat the above continously.
Build your branches slowly and you will be able to feast your eyes after a few of years!
Don't keep all the branches on one plane. elms do not grow that way. Some branches should be allowed to go up then out and some down then out. That way you will get real depth.They grow quickly so don't worry about it taking forever..it won't.
Only add 5 cm (at the most) of new growth per season. It will take you 4 years to have something satisfying to look at and after another 4 you can show it.
Thats how I do it anyway
