I am not a legal expert, but I can provide some general information on this issue. Infringement issues are complex issues involving the legal field. Specific judgments need to consider multiple factors, such as intellectual property laws and the rights and interests of the original rights holder.

If you make your own Gundam accessories and plan to sell them, it may involve issues of original copyright and trademark rights. Original copyright refers to the exclusive right to original works, such as pictures, models, etc. If your accessories are based on designs and elements from the Gundam series, then you need to consider the possibility of infringing on the original copyright.

Trademark rights refer to the exclusive rights of specific logos (such as brand names, trademark patterns). If your accessories use trademarks related to the Gundam brand, it may involve trademark infringement issues.

It needs to be emphasized that judging whether there is infringement is a complex legal issue, and many factors must be taken into consideration, such as similarity of design, impact of business competition, legal regulations and regional laws, etc. To ensure legality, you should consult a professional intellectual property lawyer who can provide accurate legal advice and advice based on the specific situation.

In short, the issue of infringement is a complex and sensitive issue, and it is very important to respect the intellectual property rights of others. When making and selling any products related to existing brands or works, you must ensure that your actions comply with applicable laws and regulations, and try to avoid the risk of infringement.