It took a long time for the other site to build up. Have patience as this site will grow with time.
Add a group so people can post what they paid and for the model(Number 1 or number 2 sienna).
Be careful of the site owner of the other site as lawsuits can cost money and the other site being for profit may loose most members.
I would even avoid saying things about that other site which could bring rise to slander or liable and don't copy it. You do not want that site owner saying you ruined his business even though we think that business will fail.
I have my own site for a different group. Membersw begin small and grow. The colors, pictures can be better then the past site with out copying the past site.
Good luck and I will be back as like most, my interest is researching things concerning the sienna from time to time.