InfiniteMac OSx86 - 105.2 Rev2 question

Hello,

I have successfully managed to install the zephyroth release (10.5.2 Rev2) on my machine and get everything working. The machine config is as follows:

AMD 64 3500+
DFI Lan party Ultra D mobo with the nforce4 chipset.
2 GB DDR RAM 2 x 1GB sticks
Nvidia 7900GT with 256 MB - NVinject 0.21
1 IDE HDD and 4 SATA HDD

I was just wondering if it is safe to upgrade to 10.5.6 through the MAC update. I installed all the other updates except this one. Do let me know if it is safe or not, or if I need to take any specific steps to get the update installed.

Another question, is it safe to use the Voodoo Kernel with this release ? What advantage would it provide ? Am a noob so bear with me ! thanks!