Aliya Summary: The walls of the Tabernacle were to be upright beams made of gold-plated acacia wood. The bottom of each beam had two projections that were to be inserted into two silver sockets. The Tabernacle’s front side (to the east) was to have no wall. Its northern and southern side were to have twenty beams each. Its western wall was to have eight. Altogether the inside of the sanctuary was 30 cubits (approx. 45 feet) by 10 cubits, and 10 cubits high. The beams were held together by several crossbars.
Rashi brings a Midrash that says that Yaakov foresaw with Divine Vision that wood would be needed by his descendants upon their departure from Egypt. He brought saplings with him to Egypt which he planted and ordered his children to take the wood with them when they left Egypt.