4E character sheet - tracking encumbrance

So since there is no encumbrance tracking on the base 4e character sheet, I was going to add a custom attribute (lets call it @{weight-limit} ) and give it X/160, where X is @{weapon-1-weight}+@{weapon-2-weight}+@{weapon-3-weight}+etc. Does anyone know the macros to call the weights from the inventory? When you add a new item to the inventory it asks for a weight and a quantity and then gives you an uneditable 'total weight' value from that. That total weight value must be able to be read somehow right?

The items section of the 4e sheet is a repeating section. Pulling attributes out of a repeating section is not officially supported. @{repeating_inventory_N_total-weight} (where N is a number indexing your inventory list) should give you the weight for the item * the number of copies of the item you're carrying. However, because it's not officially supported, the syntax may break in the future, and you might get zero warning about the change. Additionally, there is no means to determine exactly how many repeating items you have, so there's no way to automatically calculate your full load.