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Using a dropdown, or multiple choice feature, will assure you can only pick the available options and they will always appear the same.
Magento Documentation /docs/magento/basic/attributes.mdGive them verbal updates about progress, and assure them that their needs are being met. If the customer has any doubt, they will often look for ways to improve on the design themselves after the fact. You should build a contingency budget into your initial proposal.
RocketTheme Articles /blog/team/152-tips-for-presenting-website-mockups-to-clients