| CPC E06B 11/045 (2013.01) [E06B 11/026 (2013.01)] | 13 Claims |

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1. A kit, comprising:
first and second lower track sections, each lower track section comprising:
an elongate lower side wall having a body that joins a terminal heel; and
an elongate splicing element configured to join the first and second lower track sections, the splicing element having a uniform cross-sectional shape along its length and comprising:
an elongate trough; and
an elongate base having a longitudinal ridge formed therein, the ridge laterally offset from the trough;
in which the heel of the side wall of each lower track section is receivable within the trough, and in which the body of the side wall of each lower track section is positionable in face-to-face relationship with the base and in engagement with the ridge.
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